1. Department of Medicine, Division of Epidemiology, Vanderbilt Epidemiology Center, Vanderbilt University School of Medicine, Vanderbilt-Ingram Cancer Center, Vanderbilt University Medical Center, Nashville, TN, USA
2. Department of Family Medicine and Public Health, Division of Epidemiology, University of California-San Diego School of Medicine, La Jolla, CA, USA
3. Department of Preventive Medicine, Feinberg School of Medicine, Northwestern University, Chicago, IL, USA
4. Department of Medicine, Division of Gastroenterology, Vanderbilt School of Medicine, Nashville, TN, USA
5. Division of Geriatric Medicine, General Internal Medicine and Public Health, Vanderbilt University School of Medicine, Vanderbilt University Medical Center, Nashville, TN, USA
6. Department of Molecular Physiology and Biophysics, Vanderbilt University, Nashville, TN, USA
7. Department of Biostatistics, Vanderbilt University School of Medicine, Nashville, TN, USA