1. Division of Cancer Epidemiology & Genetics, National Cancer Institute, Bethesda, MD, USA,
2. Digestive Oncology Research Center, Digestive Disease Research Institute, Tehran University of Medical Sciences, Shariati Hospital, Tehran, Iran,
3. Department of Public Health Analysis, Morgan State University, Baltimore, MD, USA,
4. Surveillance and Health Services Research, American Cancer Society, Atlanta, GA, USA,
5. Golestan Research Center of Gastroenterology and Hepatology, Golestan University of Medical Sciences, Gorgan, Iran,
6. International Agency for Research on Cancer, Lyon, France and
7. Tisch Cancer Institute, Icahn School of Medicine at Mount Sinai, New York, NY, USA