1. Division of Metabolism, Endocrinology and Nutrition; VA Puget Sound Health Care System and University of Washington; Seattle Washington USA
2. Diabetes Center; Department of Internal Medicine; VU University Medical Centre; Amsterdam The Netherlands
3. Division of Gastroenterology; Department of Medicine; VA Puget Sound Health Care System and University of Washington; Seattle Washington USA
4. Epidemiologic Research and Information Center; VA Puget Sound Health Care System and University of Washington; Seattle Washington USA