1. Department of Obstetrics and Gynecology Duke University Medical Center Durham North Carolina
2. Arbor Research Collaborative for Health Ann Arbor Michigan
3. University of Michigan Ann Arbor Michigan
4. University of Iowa Carver College of Medicine Iowa City Iowa
5. Medical College of Wisconsin Milwaukee Wisconsin
6. Northwestern University Feinberg School of Medicine Chicago Illinois
7. Washington University School of Medicine St. Louis Missouri
8. University of Washington Seattle Washington
9. National Institute of Diabetes and Digestive and Kidney Diseases Bethesda Maryland