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Full text: Available Database: MEDLINE Type: Article Main subject: Pneumonia, Viral / Respiratory System / Smoking / Up-Regulation / Coronavirus Infections / Peptidyl-Dipeptidase A / Pulmonary Disease, Chronic Obstructive / Epithelium Subject: Pneumonia, Viral / Respiratory System / Smoking / Up-Regulation / Coronavirus Infections / Peptidyl-Dipeptidase A / Pulmonary Disease, Chronic Obstructive / Epithelium Type of study: Diagnostic study / Etiology study / Incidence study / Observational study / Risk factors Language: English Clinical aspect: Etiology Year: 2020