1. Department of Obstetrics and Gynecology, Washington University School of Medicine, St. Louis, Missouri.
2. Department of Preventive Medicine, Center for Healthcare Studies, Northwestern University, Chicago, Illinois.
3. Center for Healthcare Studies, Northwestern University, Chicago, Illinois.
4. Division of Epidemiology and Biostatistics, University of Illinois at Chicago School of Public Health, Chicago, Illinois.
5. Department of Clinical Pharmacy, University of California, San Francisco, California.
6. Department of Medicine, University of California, San Francisco, California.
7. Department of Epidemiology and Biostatistics, University of California, San Francisco, California.
8. Department of Obstetrics and Gynecology, Maimonides Medical Center, Brooklyn, New York.
9. Department of Medicine, Albert Einstein School of Medicine/Montefiore Medical Center, Bronx, New York.
10. Department of Obstetrics and Gynecology, Georgetown University, Washington, District of Columbia.
11. The CORE Center at John H. Stroger Jr. Hospital of Cook County, Chicago, Illinois.