1. Georgia Prevention Institute, Medical College of Georgia, Augusta, GA, USA
2. University of California, San Diego, La Jolla, CA, USA
3. Division of Geriatrics, Department of Medicine, University of Utah, Salt Lake City, UT, USA
4. Department of Exercise and Sport Science, University of Utah, Salt Lake City, UT, USA
5. Geriatric Research, Education, and Clinical Center, Salt Lake City VAMC, UT, USA