1. Intramural Research Program; Laboratory of Epidemiology, and Population Sciences; National Institute on Aging; National Institutes of Health; Bethesda MD USA
2. Department of Epidemiology; Graduate School of Public Health; University of Pittsburgh; Pittsburgh PA USA
3. Department of Endocrinology; Stanford University School of Medicine; CA USA
4. Center for Musculoskeletal Health; University of California; Davis School of Medicine; Davis CA USA
5. Division of Epidemiology; Department of Family and Preventive Medicine; University of California; San Diego, La Jolla CA USA
6. Division of Geriatrics and Aging; Columbia University; New York NY USA
7. Research Institute, San Francisco Coordinating Center; California Pacific Medical Center; San Francisco CA USA
8. School of Medicine; Oregon Health and Science University; Portland OR USA