1. Center for Gerontology, Virginia Tech, Blacksburg, Virginia, USA
2. Institute for Society, Culture, and Environment, Virginia Tech, Blacksburg, Virginia, USA
3. Department of Psychiatry and Behavioral Medicine, Virginia Tech Carilion School of Medicine, Roanoke, Virginia, USA
4. Department of Internal Medicine, Virginia Tech Carilion School of Medicine, Roanoke, Virginia, USA
5. Department of Family and Community Medicine, Virginia Tech Carilion School of Medicine, Roanoke, Virginia, USA