1. Department of Obstetrics of Gynecology, Yale University School of Medicine, New Haven, Connecticut; University of Pennsylvania Medical Center, Philadelphia, Pennsylvania
2. Department of Obstetrics of Gynecology, Yale University School of Medicine, New Haven, Connecticut; University of Pennsylvania Medical Center, Philadelphia, Pennsylvania; Reproductive and Placental Research Unit, Department of Obstetrics and Gnecology, Yale University School of Medicine, 333 Cedar Street, 312 FMB, New Haven, CT 06520-8063 http://info.med.yale.edu/obgyn/kliman