1 Pôle de Gynécologie, Institut de Recherche Expérimentale et Clinique, Université Catholique de Louvain, and Gynecology Department, Cliniques Universitaires Saint Luc, Brussels, Belgium.
2 Obstetrics and Gynecology and Women's Health Institute, Cleveland Clinic, Cleveland, Ohio.
3 Yale University Fertility Center, New Haven, Connecticut.