1. Department of Obstetrics and Gynecology, Clinica Universidad de Navarra, Pamplona, Spain;
2. Department of Obstetrics and Gynecology, Hospital Clínico Universitario de Valencia, Valencia, Spain;
3. Department of Obstetrics and Gynecology, Hospital Universitario y Politécnico, Valencia, Spain;
4. Department of Obstetrics and Gynecology, Dr Cipto Mangunkusumo National Central Hospital, Jakarta, Indonesia;
5. Gregorio Marañon Hospital, Madrid, Spain;
6. Department of Obstetrics, Gynecology, and Reproduction, Hospital Universitario Dexeus, Barcelona, Spain;
7. Department of Obstetrics and Gynecology, University of Cagliari, Policlinico Universitario Duilio Casula, Cagliari, Italy