University of Washington, VA Puget Sound Health Care System, VA Puget Sound Health Care System, University of Nebraska at Omaha - Department of Internal Medicine, affiliation not provided to SSRN, Government of the United States of America - VA Pittsburgh Healthcare System, Government of the United States of America - VA Boston Healthcare System, affiliation not provided to SSRN, University of California, San Francisco (UCSF) - Division of Rheumatology, University of Utah - Division of Epidemiology, affiliation not provided to SSRN, VA Puget Sound Health Care System - Geriatric Research Education and Clinical Center, VA Salt Lake City Health Care System, University of Nebraska Medical Center, University of Nebraska Medical Center and University of Pennsylvania - Perelman School of Medicine