1. Department of Human Development and Family Studies, College of Human Sciences, Iowa State University, Ames, Iowa, USA
2. Institute of Gerontology, University of Georgia, Athens, Georgia, USA
3. Department of Geriatric Medicine, John A. Burns School of Medicine, University of Hawaii, Honolulu, Hawaii, USA
4. Department of Research, Kuakini Medical Center, Honolulu, Hawaii, USA
5. Department of Tropical Medicine, Medical Microbiology and Pharmacology, John A. Burns School of Medicine, University of Hawaii, Honolulu, Hawaii, USA