1. Liver and Pancreatobiliary Diseases Research Center, Digestive Diseases Research Institute, Tehran University of Medical Sciences, Tehran 1461884513, Iran
2. Metabolic Epidemiology Branch, Division of Cancer Epidemiology and Genetics, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892, USA
3. Genomic Epidemiology Branch, International Agency for Research on Cancer, 69366 Lyon, France
4. Department of Biology, School of Computer, Mathematical and Natural Sciences, Morgan State University, Baltimore, MD 21251, USA
5. Stony Brook Cancer Center, Stony Brook University, Stony Brook, NY 11794, USA
6. Department of Medical and Surgical Sciences, University of Bologna, 40126 Bologna, Italy
7. Digestive Oncology Research Center, Digestive Diseases Research Institute, Tehran University of Medical Sciences, Tehran 1411713135, Iran
8. Epidemiology and Community Health Branch, Division of Intramural Research, National Heart, Lung and Blood Institute, National Institutes of Health, Bethesda, MD 20892, USA