1. Birmingham/Atlanta Geriatric Research, Education, and Clinical Center, Birmingham VA Healthcare System, Birmingham, AL 35233, USA
2. Birmingham/Atlanta Geriatric Research, Education, and Clinical Center, Atlanta VA Health Care System, Decatur, GA 30033, USA
3. Department of Medicine, Division of Preventative Medicine, University of Alabama at Birmingham, Birmingham, AL 35233, USA
4. Department of Medicine, Division of Geriatrics & Gerontology, Emory University School of Medicine, Atlanta, GA 30322, USA