1. Division of Epidemiology, Vanderbilt Ingram Cancer Center, Vanderbilt University School of Medicine, Nashville, TN
2. Department of Veterans Affairs, Tennessee Valley Healthcare System, Geriatric, Research, Education and Clinical Center, Nashville, TN
3. Department of Maternal and Child Health, School of Public Health, Fudan University, Shanghai, China
4. Division of Gastroenterology, Department of Medicine, Vanderbilt University School of Medicine, Nashville, TN
5. Department of Biomedical Informatics, Vanderbilt University, Nashville, TN
6. Departments of Nutrition and Epidemiology, Harvard School of Public Health, Boston, MA