Affiliation: | 1. Department of Epidemiology, The University of Texas MD Anderson Cancer Center, Houston, Texas;2. Department of Obstetrics and Gynecology, The First Affiliated Hospital of Harbin Medical University, Harbin, China;3. Department of Gastrointestinal Medical Oncology, The University of Texas MD Anderson Cancer Center, Houston, Texas;4. Department of Gastroenterology, Hepatology, and Nutrition, The University of Texas MD Anderson Cancer Center, Houston, Texas |