Mats Gåfvels1, Laurie G. Paavola1, Charles O. Boyd1, Patrick M. Nolan1, F. M. Wittmaack1, Ajay Chawla1, Mitchell A. Lazar1, Maja Bućan1, Bo Angelin1, Jerome F. Strauss1
1Department of Obstetrics & Gynecology, University of Pennsylvania School of Medicine, Philadelphia 19104.