1. Division of General Internal Medicine, Geriatrics and Health Policy, University of Louisville, and Louisville VA Medical Center, 501 East Broadway, Suite 320-06, Louisville, KY 40202;
2. Department of Oral Health Policy and Epidemiology, Harvard School of Dental Medicine, Department of Epidemiology, Harvard School of Public Health, Boston, MA;
3. Department of Epidemiology, Harvard School of Public Health, Boston, MA; and