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Gastrointestinal Bleeding	free resource	MedlinePlus Health Information	https://medlineplus.gov/gastrointestinalbleeding.html
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	free resource	Europe PubMed Central	https://europepmc.org/abstract/MED/28441679
	free resource	NCI CPTC Antibody Characterization Program	https://antibodies.cancer.gov/detail/CPTC-TIMP1-2
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	subscription/membership/fee required	Wolters Kluwer	https://doi.org/10.1097/ACM.0000000000001500