1. Department of Epidemiology; Center for Aging and Population Health; Graduate School of Public Health; University of Pittsburgh; Pittsburgh Pennsylvania
2. Department of Family Medicine and Community Health; Alpert Medical School; Brown University; Memorial Hospital of Rhode Island; Pawtucket Rhode Island
3. Department of Epidemiology; College of Public Health; University of Iowa; Iowa City Iowa
4. Kaiser Permanente Center for Health Research; Portland Oregon
5. School of Medicine; Stanford University; Stanford California
6. University of Massachusetts Medical School; Worcester Massachusetts
7. School of Medicine; University of Hawaii; Manoa Hawaii
8. Department of Epidemiology and Biostatistics; School of Public Health; Drexel University; Philadelphia Pennsylvania