1. Department of Medicine; Division of Epidemiology; Vanderbilt University School of Medicine; Nashville Tennessee
2. Department of Veterans Affairs; Tennessee Valley Healthcare System; Geriatric, Research, Education and Clinical Center (GRECC); Nashville Tennessee
3. Vanderbilt Ingram Cancer Center; Vanderbilt University School of Medicine; Nashville Tennessee
4. Department of Medicine; Division of Gastroenterology; Vanderbilt University School of Medicine; Nashville Tennessee
5. Institute for Public Health and Medicine; Northwestern University; Chicago Illinois
6. Department of Biomedical informatics; Vanderbilt University; Nashville Tennessee
7. Departments of Nutrition and Epidemiology; Harvard School of Public Health; Boston Massachusetts