1. Department of Obstetrics and Gynecology; University of Utah School of Medicine; Salt Lake City Utah
2. University of California; San Diego California
3. Kaiser Permanente Southern California; San Diego California
4. Stritch School of Medicine Loyola University; Chicago Illinois
5. University of Texas Southwestern Medical Center; Dallas Texas
6. William Beaumont Hospital; Royal Oak Michigan
7. University of Alabama at Birmingham; Birmingham Alabama
8. Yale University; New Haven Connecticut
9. University of Texas Health Science Center; San Antonio Texas
10. University of Pittsburgh; Magee-Womens Research Institute; Pittsburgh Pennsylvania
11. New England Research Institutes; Watertown Massachusetts