1. Unit of Reproductive Medicine , Department of Obstetrics and Gynecology , Hospitalar Center São João , Porto , Portugal
2. Department of Gynecology and Obstetrics , Faculty of Medicine , University of Porto, Hospitalar Center S. João, Instituto de Investigação e Inovação em Saúde , Porto , Portugal
3. Department of Obstetrics and Gynecology , Kaplan Medical Center , Rehovot , Israel