1. Department of Endocrinology and Metabolism, Ajou University School of Medicine, Suwon, Korea.
2. Seattle Epidemiologic Research and Information Center, VA Puget Sound Health Care System, Seattle, WA, USA.
3. Department of Medicine, University of Washington School of Medicine, Seattle, WA, USA.
4. Department of Internal Medicine, CHA Bundang Medical Center, CHA University School of Medicine, Seongnam, Korea.
5. Hospital and Specialty Medicine Service, VA Puget Sound Health Care System, Seattle, WA, USA.
6. Department of Anthropology, University of Washington, Seattle, WA, USA.