1 Western Honduras Gastric Cancer Prevention Initiative, Western Regional Hospital, Hospital de Occidente, Avenida Solidaridad, 41101, Santa Rosa de Copan, Honduras.
2 Division of Gastroenterology and Hepatology, University of North Carolina School of Medicine, 4182, Bioinformatics, 130 Mason Farm RD, Chapel Hill, NC, 27599-6134, USA.
3 Center for Functional Gastrointestinal and Motility Disorders, University of North Carolina School of Medicine, 130 Mason Farm Road, CB# 7080, Chapel Hill, NC, 27599, USA.
4 Division of Gastroenterology and Hepatology, The University of Alabama at Birmingham (UAB), 373 Boshell Building, 1720 2 Avenue South, Birmingham, AL, 35294-0012, USA. drmorgan@uabmc.edu.