Affiliation: | 1. Division of Gastroenterology, The Johns Hopkins University School of Medicine, Baltimore, Maryland, USA;2. Department of Pathology, The Johns Hopkins University School of Medicine, Baltimore, Maryland, USA;1. Department of Surgery, Tenwek Hospital, Bomet, Kenya;2. Department of Surgery, Alpert Medical School of Brown University, Providence, Rhode Island, USA;3. Paul L. Foster School of Medicine at Texas Tech University Health Sciences Center El Paso, El Paso, Texas, USA;4. Department of Medicine, Hemato-oncology Unit, Kenyatta National Hospital, Nairobi, Kenya;5. Department of Epidemiology, Gillings School of Global Public Health, University of North Carolina, Chapel Hill, North Carolina, USA;6. Division of Cancer Epidemiology and Genetics, National Cancer Institute, National Institutes of Health, Bethesda, Maryland, USA |