1. Department of Epidemiology and Biostatistics, School of Public Health West Virginia University Morgantown WV USA
2. Departments of Health and Human Development, School of Education University of Pittsburgh PA USA
3. Division of Cardiology, Department of Medicine University of Pittsburgh School of Medicine Pittsburgh PA USA
4. Division of General Internal Medicine, Department of Internal Medicine University of Utah Salt Lake City UT USA
5. Division of Cardiology, Department of Medicine Columbia University Irving Medical Center New York NY USA
6. Division of Geriatric Medicine and Department of Biostatistics University of Pittsburgh Pittsburgh PA USA