Department of Internal Medicine;
American University of Beirut-Medical Center;
Biostatistics Support Unit;
Clinical Research Institute;
American University of Beirut-Medical Center;
Department of Internal Medicine;
University of Pittsburgh Medical Center;
Department of Internal Medicine;
the Medical University of South Carolina;
Division of Gastroenterology and Hepatology;
American University of Beirut-Medical Center;
Aspirin; Morbidity; Mortality; Non-variceal; upper; gastrointestinal; bleeding; Outcomes;