1. Geriatric Research Educational and Clinical Center (GRECC), VA Medical Center, St. Louis, MO, USA
2. Department of Internal Medicine, Division of Geriatric Medicine, St. Louis University School of Medicine, St. Louis, MO, USA
3. Department of Internal Medicine, Division of Endocrinology, St. Louis University School of Medicine, St. Louis, MO, USA
4. Division of Geriatric Medicine, University of Palermo, Palermo, Italy
5. Department DEMETRA, Agronomy Faculty, University of Palermo, Palermo, Italy
6. Geriatric Research Educational and Clinical Center (GRECC), Veterans Affairs Puget Sound Health Care System, Seattle, WA, USA
7. Department of Internal Medicine, Division of Gerontology and Geriatric Medicine, University of Washington School of Medicine, Seattle, WA, USA
8. Department of Chemistry, Missouri University of Science and Technology, Rolla, MO, USA