1. Pfizer Inc, Collegeville, Pennsylvania.
2. University of Virginia Health System, Charlottesville, Virginia.
3. University of California, San Francisco, California.
4. East Bay Physicians Medical Group, Berkeley, California.
5. Pfizer Inc, Groton, Connecticut.
6. Columbia University Medical Center, New York, New York.
7. Clinical Research Center, Department of Obstetrics and Gynecology, Eastern Virginia Medical School, Norfolk, Virginia.