1 Facultad de Medicina, Departamento de Gastroenterología, Pontificia Universidad Católica de Chile, Santiago, Chile.
2 Centro para la Prevención y el Control del Cáncer, Santiago, Chile.
3 Division of Cancer Epidemiology and Genetics, National Cancer Institute, Bethesda, Maryland, United States.
4 Faculty of Medicine and Dentistry, Department of Medicine, University of Alberta, Edmonton, Alberta, Canada.
5 Division of Gastroenterology, Hepatology, and Nutrition, Department of Medicine, Vanderbilt University Medical Center, Nashville, Tennessee, United States.
6 Gastrointestinal Cancer Department and Translational Medicine Laboratory, Instituto Nacional de Cancerología, Mexico City, Mexico.
7 Oncology Research Center, Federal University of Pará, Belém, Pará, Brazil.