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1.
Biomed Tech (Berl) ; 64(s1): 75-155, 2019 Feb 01.
Article in English | MEDLINE | ID: mdl-30753150
2.
Cleft Palate Craniofac J ; 47(1): 15-21, 2010 Jan.
Article in English | MEDLINE | ID: mdl-19860496

ABSTRACT

OBJECTIVE: To analyze the prenatal ultrasound findings of the craniofacial and extracephalic anatomy, the postnatal pathological findings, and the genetic anomalies in 51 cases of holoprosencephaly (HPE). MATERIALS AND METHODS: Between 1990 and 2005, a collective of 51 fetuses with tentative ultrasound diagnosis of HPE was recruited at two tertiary referral centers for prenatal ultrasound diagnostics via the Pia Fetal Database (GEMedical Systems, Webling, Germany). Cephalic as well as extracephalic anomalies were investigated, and all cases were subdivided into the subgroups lobar, a lobar, and semilobar HPE. In addition to the ultrasound investigation, 45 fetuses were analyzed for genetic anomalies and 21 fetuses underwent an autopsy. RESULTS: The average age at diagnosis was 21.9 weeks of gestation. There was a greater number of female fetuses, with an overall ratio of 2.67:1. In 61% of all cases, there was a reduction of growth in comparison with healthy fetuses of the same age. Within the second trimenon, the cephalic anomalies became evident when investigating the diameter of the fetal head (second trimenon: 71%below the fifth percentile; third trimenon: 92% below the fifth percentile). In 82%of the cases, extracephalic anomalies were diagnosed additionally. In 63%, the diagnosis of holoprosencephaly led to a termination of pregnancy. Ten percent of the fetuses were born alive. In 81% of the cases, the diagnosis of HPE was confirmed postnatally. The remaining 19% showed other severe cephalic and extracephalic anomalies. Chromosomal anomalies were detected in 79% of the fetuses, most frequently trisomy 13 (59%). DISCUSSION: Because of recent advances in the development and improvement of high-resolution ultrasound, early diagnosis of congenital anomalies such as HPE is now possible. In this study, which represents the largest collection of prenatally diagnosed HPE reported in the literature to date, the average age at diagnosis was earlier than in other studies. The ultrasound devices of today provide excellent images of the fetus that allow an exact diagnosis of craniomaxillofacial anomalies as well as extracephalic anomalies. Apart from a very few cases, the diagnosis of HPE is incompatible with life.


Subject(s)
Holoprosencephaly/diagnostic imaging , Ultrasonography, Prenatal , Adolescent , Adult , Chromosome Disorders/diagnostic imaging , Chromosome Disorders/genetics , Congenital Abnormalities/diagnostic imaging , Congenital Abnormalities/genetics , Craniofacial Abnormalities/diagnostic imaging , Craniofacial Abnormalities/genetics , Female , Germany , Holoprosencephaly/genetics , Humans , Infant, Newborn , Karyotyping , Male , Pregnancy , Pregnancy Trimester, Second , Young Adult
3.
Ann Hematol ; 84(8): 538-44, 2005 Aug.
Article in English | MEDLINE | ID: mdl-15703928

ABSTRACT

Since limited knowledge exists on the mechanisms which regulate cell binding to leukocyte removal filter surfaces, we investigated the binding patterns of leukocytes to individual layers of leukocyte depletion filters. After passage of 1 unit of whole blood, blotting of isolated filter layers on glass slides or elution of cells from filter layers revealed that most leukocytes were located within the first 10 of a total of 28 filter layers, peaking at layers 6 to 8, with granulocytes binding on average to earlier filter layers than lymphocytes. Leukocytes preincubated with inhibitors of actin activation showed unchanged distribution between filter layers, suggesting that cytoskeletal activation does not significantly contribute to their binding. When leukocytes were directly incubated with single filter layers, binding of up to 30% of input cells was recorded in the absence of Ca(2+). Immunohistological analyses showed colocalization of platelets and leukocytes, with co-clustering of platelets and leukocytes. Monocytes and to some degree lymphocytes but not granulocytes competed with platelets for filter binding. Precoating of filter layers with individual plasma components showed that hyaluronic acid, plasma type fibronectin, and fibrinogen all increased the binding of leukocytes compared with albumin coating. In conclusion, leukocytes can bind passively to filters in a process which does not require Ca(2+), which is independent of cytoskeletal activation and which may depend on individual plasma components. These results are of importance when new selective cell enrichment or depletion strategies through specific filters are envisaged.


Subject(s)
Leukocyte Reduction Procedures , Leukocytes/cytology , Blood Cells/cytology , Blood Platelets/cytology , Blood Proteins/pharmacology , Calcium/pharmacology , Cell Adhesion , Cell Communication , Cytoskeleton , Filtration/instrumentation , Humans
4.
Radiologe ; 41(10): 884-90, 2001 Oct.
Article in German | MEDLINE | ID: mdl-11715579

ABSTRACT

The transjugular intrahepatic stent-shunt (TIPSS) is a well accepted minimal invasive therapy for complications of portal hypertension: recurrent variceal bleeding, refractory ascites and liver failure due to the Budd-Chiari syndrome. The high frequency of shunt stenoses and occlusions makes regular follow up examinations essential. Despite modern non invasive imaging methods direct portography still is the gold standard for shunt surveillance in TIPSS. Ultrasound is helpful to detect shunt dysfunction, but nevertheless its failure rate is considerable despite the use of contrast enhancers such as Levovist because of anatomic and physical limitations, particularly when TIPSS-tracts deep in the liver are present. Reintervention rates approach 90-100% after 24 months, with 100% in child's A patients with comparatively good liver function. However, a strict shunt surveillance program with early portography and reintervention when necessary guarantees high clinical success rates associated with very low rebleeding rates below 10%. Overall the secondary success rate is 80%. Secondary failures are mainly caused by lack of patient compliance during follow-up. In a subgroup of patients no shunt maturation is observed, requiring multiple shunt revisions. In cases of recurrent shunt occlusions an association with bile leaks is presumed. In selected cases patients with chronically recurrent shunt stenosis or occlusions may benefit from placement of TIPSS stent grafts.


Subject(s)
Aftercare , Diagnostic Imaging , Hypertension, Portal/diagnosis , Portasystemic Shunt, Transjugular Intrahepatic , Equipment Failure , Humans , Hypertension, Portal/therapy , Retreatment
5.
Radiologe ; 41(8): 674-80, 2001 Aug.
Article in German | MEDLINE | ID: mdl-11552382

ABSTRACT

GOAL: To identify essential and relevant diagnostic algorithms in the follow-up of stent-grafts placed for aortic dissections and aneurysms based on our 7 years experience including the use of more than 10 different devices. MATERIAL AND METHODS: Evaluation of conventional biplane imaging, angiography, sonography, CT and MR in the efficacy of demonstrating endoleaks, sac shrinkage, changes of stent-graft integrity and, with special reference to MR-compatibility of various stent-graft devices. RESULTS: Endoleaks are found in 20-30% of patients after endovascular exclusion of abdominal aortic aneurysms. However, this rate neither necessarily reflects the clinical course nor the onset and course of sac shrinkage. Physical long-term integrity of the devices is seen best on conventional bi-plane radiographs. Sonography is helpful only in selected patients (non-obese, good compliance) otherwise not providing information precisely enough for sac control. As gold standard both CT (CTA) and MR (MRA) are equally effective in the follow-up of endovascular stent-grafts, allowing 3D control of sac geometry in aneurysmal disease or hemodynamic changes in stent-grafts for aortic dissection. MRI is considered to be more effective in the detection of small endoleaks. Angiography is inferior to CT and MRI in the diagnosis of endoleaks and thus is required only for intervention planning in patients with suspected endoleaks. Two of 8 evaluated stent-graft devices proved to be prohibitive for MRI because of their severe artifacts productions (Life-path, Zenith) as a result of their thick metallic meshwork. CONCLUSION: CT including CTA with 2D and 3D reformatting is the method of choice for the follow up of stent-graft treatment of aortic disease. Depending on availability, MRI may be used alternatively. In young patients and for those with contraindications to iodinated contrast media MRI is a perfectly equivalent alternative. Especially in patients with known contraindications to iodinated contrast media the MR-compatibility should be taken into consideration in the choice of the endovascular device.


Subject(s)
Aortic Aneurysm, Abdominal/surgery , Aortic Dissection/surgery , Aortography , Magnetic Resonance Angiography , Postoperative Complications/diagnosis , Stents , Tomography, X-Ray Computed , Aged , Aortic Dissection/diagnosis , Aortic Aneurysm, Abdominal/diagnosis , Female , Follow-Up Studies , Humans , Image Processing, Computer-Assisted , Imaging, Three-Dimensional , Male , Middle Aged , Postoperative Complications/surgery , Prosthesis Failure , Reoperation , Sensitivity and Specificity
6.
Rofo ; 173(8): 724-30, 2001 Aug.
Article in German | MEDLINE | ID: mdl-11570243

ABSTRACT

PURPOSE: To compare thin-section hydro-CT and MRI in the detection of pancreatic neoplasms. Evaluation of an oral, superparamagnetic contrast agent (OMP) for pancreatic MRI. MATERIAL AND METHODS: 45 patients with suspected pancreatic neoplasms were examined with consecutive thin-section helical CT (Hydro-CT, 3/6/3, 130 ml Ultravist, Schering) and MRI (1.0 T, breath-holding, T1w-GRE, T1w-GRE fat-sat, T2w-TSE). The MRI protocol included precontrast studies, studies after oral administration of OMP (Abdoscan, Nycomed Amersham) and studies after administration of OMP and Gadodiamide i.v. (Omniscan, Nycomed Amersham). All images were assessed by two independent radiologists in a blinded fashion. Radiologic diagnosis was correlated with histology or clinical follow-up (> or = 3 month). RESULTS: 39 patients could be included in analysis. In 13 cases a pancreatic neoplasm was proven by histology. Thin-section hydro-CT and MRI showed no statistically significant differences for the detection of pancreatic neoplasia. The sensitivity of helical hydro-CT was superior compared to MRI (88.5% vs. 65.44/73.1%/76.9%). The specificity of MRI was superior compared to helical hydro-CT (86.5% vs. 94.2%/90.4%/88.5%). CONCLUSION: Thin-section hydro-CT and MRI show similar results for the detection of pancreatic neoplasms. Compared to thin-section helical CT, MRI still has the drawbacks of much more time consumption and, still, lower spatial resolution. The use of an oral, superparamagnetic contrast agent added no advantage for pancreatic MRI.


Subject(s)
Contrast Media/administration & dosage , Magnetic Resonance Imaging/methods , Pancreatic Neoplasms/diagnosis , Tomography, X-Ray Computed/methods , Administration, Oral , Biopsy , Data Interpretation, Statistical , Female , Ferric Compounds/administration & dosage , Gadolinium DTPA/administration & dosage , Humans , Injections, Intravenous , Iron/administration & dosage , Male , Middle Aged , Oxides/administration & dosage , Pancreas/pathology , Pancreatic Neoplasms/diagnostic imaging , Pancreatic Neoplasms/pathology , Prospective Studies , Sensitivity and Specificity
7.
Int J Sports Med ; 22(4): 275-9, 2001 May.
Article in English | MEDLINE | ID: mdl-11414670

ABSTRACT

The aim of this study was to determine long term changes in shoulder and elbow joints of former elite javelin throwers. Twenty-one elite javelin throwers were examined at an average of 19 years after the end of their high performance phase. Mean age at examination was 50 years. Functional assessment of both shoulders was determined by the Constant-score. The shoulder of the throwing arm was examined by magnetic resonance imaging. Both elbow joints were examined clinically and radiographically. Five athletes complained about transient shoulder pain in their throwing arm affecting activities of daily living, fourteen athletes had a deficit of internal rotation of at least ten degrees. Constant-scores of throwing arms were six points lower than those of non-throwing arms (P < 0.05). Complete ruptures and partial tears of the rotator cuff were frequent. Three athletes complained about transient elbow pain in their throwing arm affecting activities of daily living; ten athletes had a deficit of extension of more than five degrees. All dominant elbows had advanced arthrotic alterations (osteophytes, sclerosis) compared to the non-dominant side. Athletes who trained with weights of more than 3 kg had a significantly higher risk of degenerative changes than athletes who did not (P < 0.01). We therefore recommend to avoid throwing training with weights of more than 3 kg.


Subject(s)
Activities of Daily Living , Arm Injuries/etiology , Arm Injuries/physiopathology , Osteoarthritis/etiology , Osteoarthritis/physiopathology , Track and Field/statistics & numerical data , Adult , Arm Injuries/diagnosis , Humans , Male , Middle Aged , Osteoarthritis/diagnosis , Statistics, Nonparametric , Time Factors
8.
Rofo ; 173(1): 4-11, 2001 Jan.
Article in German | MEDLINE | ID: mdl-11225416

ABSTRACT

Chronic inflammatory bowel disease is diagnosed and monitored by the combination of colonoscopy and small bowel enteroklysis. Magnetic resonance imaging has become the gold standard for the imaging of perirectal and pelvic fistulas. With the advent of ultrafast MRI small and large bowel imaging has become highly attractive and is being advocated more and more in the diagnostic work up of inflammatory bowel disease. Imaging protocols include fast T1-weighted gradient echo and T2-weighted TSE sequences and oral or rectal bowel distension. Furthermore, dedicated imaging protocols are based on breath-hold imaging under pharmacological bowel paralysis and gastrointestinal MR contrast agents (Hydro-MRI). High diagnostic accuracy can be achieved in Crohn's disease with special reference to the pattern of disease, depth of inflammation, mesenteric reaction, sinus tract depiction and formation of abscess. In ulcerative colitis, the mucosa-related inflammation causes significantly less bowel wall thickening compared to Crohn's disease. Therefore with MRI, the extent of inflammatory changes is always underestimated compared to colonoscopy. According to our experience in more than 200 patients as well as the results in other centers, Hydro-MRI possesses the potential to replace enteroklysis in the diagnosis of chronic inflammatory bowel disease and most of the follow-up colonoscopies in Crohn's disease. Further technical improvements in 3D imaging will allow interactive postprocessing of the MR data.


Subject(s)
Colitis, Ulcerative/diagnosis , Crohn Disease/diagnosis , Magnetic Resonance Imaging , Adult , Barium Sulfate , Colitis, Ulcerative/diagnostic imaging , Colitis, Ulcerative/pathology , Colon/pathology , Colonoscopy , Contrast Media , Crohn Disease/diagnostic imaging , Crohn Disease/pathology , Diagnosis, Differential , Enema , Female , Humans , Magnetic Resonance Imaging/methods , Male , Middle Aged , Rectal Fistula/diagnosis , Ultrasonography
9.
Rofo ; 172(11): 879-87, 2000 Nov.
Article in German | MEDLINE | ID: mdl-11142119

ABSTRACT

PURPOSE: Development of an optimized Spiral CT protocol type for the diagnosis of aortic dissections. MATERIAL AND METHODS: 121 consecutive CT examinations applying 5 different protocol types were blindly read by two experienced radiologists and then compared with: (a) 45 biplane transesophageal echocardiographies (TEE), (b) 52 transthoracic echocardiographies (TTE), (c) 52 operative findings and, furthermore, related to the clinical course over at least six months in 79 patients. RESULTS: The sensitivity of the spiral computed tomography for detection of dissection was 97% (biplane TEE: 88%), the specificity 100% (biplane TEE: 91%). In 15% dissections with atypical origin and entries (mid-portion of the aortic arch, distal thoracic aorta, etc.) were found. The optimal CT-protocol was the one with a combination of two separate but adjacent spiral scans achieving high spatial resolution for the aortic arch and enough spatial resection for the residual aorta (1. helical scan 3 mm collimation, pitch 2. 2. helical scan 5 mm collimation and pitch 2, 130 ml contrast medium at 5 ml/s) with a classification accuracy of 100%, visualization of entries of 100%, reentries of 100% (40% direct, 60% indirect). The identification of the ostia of the aortic branches were: supraaortic 93%, visceral 100%, left renal artery 100%, right renal artery 93%, iliac 64%. The CT angiography, designed as aortic arch angiography, showed a good contrast in the aortic arch vessels (79-86%) and the visceral vessels too (91%). CONCLUSION: Thoracic CT angiography can be used as gold standard in the primary evaluation of aortic dissections.


Subject(s)
Aortic Aneurysm/diagnostic imaging , Aortic Dissection/diagnostic imaging , Aortography/methods , Tomography, X-Ray Computed/methods , Adolescent , Adult , Aged , Aged, 80 and over , Echocardiography, Transesophageal/methods , False Negative Reactions , False Positive Reactions , Female , Humans , Male , Middle Aged , Observer Variation , Prospective Studies , Reproducibility of Results , Sensitivity and Specificity
10.
Radiologe ; 39(9): 783-9, 1999 Sep.
Article in German | MEDLINE | ID: mdl-10525637

ABSTRACT

Today the relevance of renal tumor embolization is not determined only by the technical and clinical success of the method. Progress in diagnosis of early stages of renal carcinomas as well as the improvement of both surgical techniques and anesthetic procedures have lead to a change in the selection of patients for embolization. Preoperative embolization of advanced renal cell carcinomas with tumor thrombus into the vena cava or of T4 tumors is now an established clinical procedure. The complete occlusion of the vascular bed of the tumors leads to a considerable reduction in intraoperative blood loss and to simplification of the surgical preparation. By using Ethibloc for embolization, palliation of a hemorrhage or of tumor-related pain in inoperable patients is usually successful. Although local control of the tumor disease, including complete tumor ablation, is achieved by embolization, the median survival rate of our palliatively embolized patients is only 3.5 months. This short life expectancy in the group of inoperable patients has to be acknowledged individually in patients considered for palliative embolization who are free of symptoms related the tumor.


Subject(s)
Embolization, Therapeutic , Kidney Neoplasms/therapy , Aged , Aged, 80 and over , Angiography , Diatrizoate , Drug Combinations , Ethanol , Fatty Acids , Female , Follow-Up Studies , Humans , Kidney Neoplasms/blood supply , Kidney Neoplasms/mortality , Kidney Neoplasms/pathology , Male , Middle Aged , Neoadjuvant Therapy , Neoplasm Staging , Palliative Care , Propylene Glycols , Survival Rate , Tomography, X-Ray Computed , Treatment Outcome , Zein
11.
Radiologe ; 38(6): 523-9, 1998 Jun.
Article in German | MEDLINE | ID: mdl-9700773

ABSTRACT

Adjuvant chemotherapy has significantly improved the prognosis of patients with bone sarcomas. Preoperative diagnostic imaging of tumor response to such therapy has become a mainstay for the assessment of prognosis, planning of surgery and further treatment. During therapy, responding tumors show characteristic changes on conventional radiography, angiography, sonography, radionuclide studies, CT and MR. The usefulness and the limitations of each imaging modality in assessing response to therapy are reviewed. The diagnostic importance of specific changes such as tumor volume reduction, calcification and tumor vascularization is discussed.


Subject(s)
Bone Neoplasms/diagnosis , Diagnostic Imaging , Adolescent , Adult , Bone Neoplasms/diagnostic imaging , Child , Diagnostic Imaging/methods , Female , Humans , Magnetic Resonance Imaging , Male , Osteosarcoma/diagnosis , Osteosarcoma/diagnostic imaging , Radiography , Radionuclide Imaging , Sarcoma, Ewing/diagnosis , Sarcoma, Ewing/diagnostic imaging , Ultrasonography
12.
Orthopade ; 27(5): 269-73, 1998 May.
Article in German | MEDLINE | ID: mdl-9646317

ABSTRACT

Therapeutic interventions in the skeletal system are an essential part of interventional radiology. Although in terms of figures these procedures are applied less frequently, they are very effective. Percutaneous transarterial embolization of a spinal tumor is well-established interventional treatment. It is primary treatment for preoperative devascularization, but also for palliation of pain and for reduction of tumor volume. As an alternative access for embolization, direct percutaneous puncture of a vertebra is used. A new and promising technique is vertebroplasty, the percutaneous injection of acrylic surgical cement in destroyed vertebrae. The present paper discusses indications, technique, results and complications of these interventional therapeutic modalities in the treatment of primary and secondary spinal tumors.


Subject(s)
Carcinoma, Hepatocellular/pathology , Carcinoma, Renal Cell/pathology , Embolization, Therapeutic , Radiography, Interventional , Spinal Neoplasms/pathology , Bone Transplantation , Carcinoma, Hepatocellular/diagnostic imaging , Carcinoma, Hepatocellular/secondary , Carcinoma, Hepatocellular/surgery , Carcinoma, Renal Cell/diagnostic imaging , Carcinoma, Renal Cell/secondary , Carcinoma, Renal Cell/surgery , Female , Humans , Male , Osteolysis/etiology , Spinal Neoplasms/diagnostic imaging , Spinal Neoplasms/secondary , Spinal Neoplasms/surgery , Spine/surgery
13.
Orthopade ; 27(4): 224-30, 1998 Apr.
Article in German | MEDLINE | ID: mdl-9616881

ABSTRACT

Metastases are the most common malignant tumors of the skeleton. Several imaging modalities can be engaged for the diagnosis of skeletal metastases. They may be combined, depending on the individual clinical setting. Plain films are used for evaluation of symptomatic regions of the skeleton. Sensitivity is low, but benign skeletal disorders causing clinical symptoms can usually be identified in plain films. Bone scintigraphy is employed for a survey of the entire skeleton with high sensitivity for the presence of metastases, but only poor specificity. Computed tomography (CT) and magnetic resonance imaging (MRI) are advanced diagnostic methods, essential particularly in the diagnosis of metastatic spinal disease. Using CT, additional percutaneous bone biopsies can be performed easily and safely. Of all imaging modalities, MRI has the highest sensitivity for skeletal metastases. Other advantages are the possibility of multidirectional slice positioning and excellent soft tissue contrast.


Subject(s)
Bone Neoplasms/secondary , Bone Neoplasms/diagnostic imaging , Breast Neoplasms/pathology , Cervical Vertebrae/diagnostic imaging , Diagnostic Imaging/methods , Female , Humans , Magnetic Resonance Imaging , Radionuclide Imaging , Thoracic Vertebrae/diagnostic imaging , Tomography, X-Ray Computed
14.
Rofo ; 167(2): 132-8, 1997 Aug.
Article in German | MEDLINE | ID: mdl-9333353

ABSTRACT

PURPOSE: Evaluation of hydro-MRI in the diagnosis of chronic inflammatory bowel disease (IBD). MATERIAL AND METHODS: 33 patients with suspected Crohn's disease or ulcerative colitis were studied prospectively. After distension of the colon by a rectal enema, breathhold MR imaging was performed during bowel relaxation. Results were compared to the clinical diagnosis, endoscopy, barium studies and histopathology. RESULTS: 24/24 patients with active Crohn's disease were correctly diagnosed by MRI. Conversely, MRI was positive in only 2/5 patients with ulcerative colitis. In 5 patients the presence of IBD was excluded. There were no false positives. CONCLUSION: Hydro-MRI is a very reliable modality in the diagnosis of Crohn's disease. In the differentiation of Crohn's disease from ulcerative colitis, hydro-MRI seems to be a promising imaging procedure.


Subject(s)
Enema/methods , Inflammatory Bowel Diseases/diagnosis , Magnetic Resonance Imaging/methods , Adolescent , Adult , Aged , Colitis, Ulcerative/diagnosis , Colon/pathology , Constriction, Pathologic/diagnosis , Crohn Disease/diagnosis , Diagnosis, Differential , Female , Humans , Intestinal Fistula/diagnosis , Male , Middle Aged , Prospective Studies
16.
J Health Polit Policy Law ; 14(1): 57-85, 1989.
Article in English | MEDLINE | ID: mdl-2654282

ABSTRACT

In 1984, federal legislation outlawing payment for human organs for transplantation was adopted after only cursory discussion of the underlying policy issues. More considered analysis suggests that this prohibition may be overly broad. It appears possible to design suitably regulated market-type approaches to the acquisition and allocation of cadaveric organs (and perhaps of organs from living donors as well) that will be neither unduly offensive to ethical sensibilities nor easily abused and that may yield significant improvements over the existing system of organ procurement, which presents important ethical and practical problems of its own. Moreover, whatever ultimate judgment we reach concerning the merits of markets for transplantable organs, analysis of the sources of the initial moral resistance to the commercialization that lies behind measures such as the 1984 legislation offers insights into the respective roles of market and nonmarket institutions in general.


Subject(s)
Ethics, Medical , Human Body , Marketing of Health Services/economics , Resource Allocation , Risk Assessment , Tissue and Organ Procurement/economics , Federal Government , Insurance, Health/economics , Marketing of Health Services/legislation & jurisprudence , Patient Selection , Social Control, Formal , Tissue and Organ Procurement/legislation & jurisprudence , United States
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