1. Kaiser Permanente Washington Health Research Institute, Seattle, Washington
2. Psychosocial and Community Health Department, School of Nursing, University of Washington, Seattle, Washington
3. College of Nursing and Health Sciences, University of Massachusetts Boston, Massachusetts
4. Department of Anesthesiology and Pain Medicine, University of Washington, Seattle, Washington
5. Department of Medicine, Beth Israel Deaconess Medical Center, Boston, Massachusetts
6. Division of Rheumatology, Beth Israel Deaconess Medical Center, Boston, Massachusetts
7. New England Geriatric Research Education and Clinical Center, VA Boston Healthcare System, Boston, Massachusetts
8. Spaulding Rehabilitation Hospital, Boston, Massachusetts
9. Department of Physical Medicine and Rehabilitation, Harvard Medical School, Boston, Massachusetts
10. Department of Medicine, Harvard Medical School, Boston, Massachusetts