1. Department of Obstetrics and Gynecology Clínica Universidad de Navarra Pamplona Spain
2. Department of Obstetrics and Gynecology University Hospital Badajoz Spain
3. Department of Obstetrics and Gynecology University Hospital Castellón Spain
4. Department of Obstetrics and Gynecology Puerta de Mar University Hospital Cadiz Spain
5. Department of Obstetrics and Gynecology La Fe University Hospital Valencia Spain
6. Department of Obstetrics, Gynecology, and Reproduction Hospital Universitari Dexeus Barcelona Spain
7. Centro Integrato di Procreazione Medicalmente Assistita e Diagnostica Ostetrico–Ginecologica Azienda Ospedaliero Universitaria–Policlinico Duilio Casula Monserrato Monserrato Italy
8. Department of Obstetrics and Gynecology University of Cagliari Cagliari Italy