1. Department of Preventive Medicine and Community Health, University of Texas Medical Branch, Galveston, Texas.
2. Community Health Services, University of Texas Medical Branch, Galveston, Texas.
3. Department of Medicine, Baylor College of Medicine, Houston, Texas.
4. Michael E. DeBakey VA Medical Center Health Services Research and Development Center of Excellence, Houston, Texas.
5. Department of Medicine, Emory University, Atlanta, Georgia.
6. Department of Obstetrics and Gynecology, University of Texas Medical Branch, Galveston, Texas.
7. Department of Medicine, University of Texas Medical Branch, Galveston, Texas.