1. Geriatric Research, Education, and Clinical Center and Mental Health, VA Greater Los Angeles Healthcare System, Los Angeles, California, USA.
2. David Geffen School of Medicine at UCLA, Departments of Internal Medicine and Psychiatry, Los Angeles, California, USA.
3. Geriatric Research, Education, and Clinical Center, VA Health Care System, Durham, North Carolina, USA.
4. Department of Orthopedic Surgery, Duke University Medical Center, Durham, North Carolina, USA.
5. Roybal Center, Duke University Medical Center, Durham, North Carolina, USA.
6. Center for the Study of Aging/Claude D. Pepper Older Americans Independence Center, Department of Medicine, Duke University Medical Center, Durham, North Carolina, USA.
7. Geriatric Research, Education, and Clinical Center, Eastern Colorado Health Care System, Aurora, Colorado, USA.
8. Department of Emergency Medicine, University of Colorado, Aurora, Colorado, USA.