1. Division of General Internal Medicine, Department of Internal Medicine, University of Michigan, Ann Arbor, Michigan.
2. Department of Obstetrics & Gynecology, University of Michigan, Ann Arbor, Michigan.
3. Division of Metabolism, Endocrinology, and Diabetes, Departments of Internal Medicine and Epidemiology, University of Michigan, Ann Arbor, Michigan.
4. Department of Epidemiology, School of Public Health, University of Michigan, Ann Arbor, Michigan.
5. Department of Veterans Affairs Center for Practice Management and Outcomes Research, Ann Arbor, Michigan.