1. Center for Gerontology and Healthcare Research, Department of Health Services, Policy, and Practice, Brown University School of Public Health, Providence, Rhode Island, USA.
2. U.S. Department of Veterans Affairs Medical Center, Providence, Rhode Island, USA.
3. Warren Alpert School of Medicine, Brown University, Providence, Rhode Island, USA.
4. Institute on Aging, Portland State University, Portland, Oregon, USA.
5. School of Public Health, Oregon Health and Science University - Portland State University, Portland, Oregon, USA.