1. Digestive Oncology Research Center, Digestive Disease Research Institute, Tehran University of Medical Sciences, Tehran, Iran,
2. Division of Cancer Epidemiology and Genetics, National Cancer Institute, NIH, Bethesda, MD, USA,
3. Non-Communicable Disease Research Center, Shiraz University of Medical Sciences, Shiraz, Iran,
4. Gastroenterohepatology Research Center, Shiraz University of Medical Sciences, Shiraz, Iran,
5. Liver and Pancreaticobilliary Research Center, Digestive Disease Research Institute, Tehran University of Medical Sciences, Tehran, Iran,
6. Surveillance and Health Services Research, American Cancer Society, Atlanta, GA, USA and
7. The Tisch Cancer Institute, Icahn School of Medicine at Mount Sinai and Institute for Translational Epidemiology, New York, NY, USA