1. Department of Obstetrics; Gynecology and Reproductive Sciences; Yale School of Medicine; New Haven CT
2. Department of Biostatistics and the Yale Center for Analytic Studies; Yale School of Public Health; New Haven CT
3. RAND Corporation; Arlington VA
4. RAND Corporation; Santa Monica CA
5. Division of General Internal Medicine and Health Services Research; UCLA Department of Medicine; Los Angeles CA
6. Department of Health Policy and Management; Yale School of Public Health; New Haven CT