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Currently undertaking a Research Fellowship at the National Institutes of Health, USA. CH: Vanier Scholar and PhD Candidate, School of Population and Public Health, Faculty of Medicine, University of British Columbia, Vancouver, BC, Canada, CP: Associate Professor of Medicine, University Hospital of Brooklyn, New York, USA, CN: Attending physician at CHUB, VD: Attending physician at CHUK, Academic Head of Medicine, University of Rwanda, JN: Senior anesthesiologist at CHUB, FN: Gastroenterologist at CHUK, DH: Emeritus Professor of Medicine at University of Utah, School of Medicine, CB: Associate Professor of Medical Microbiology, University of Rwanda. 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