1. Department of Obstetrics and Gynecology Hospital QuirónSalud Santa Cruz de Tenerife Spain
2. Department of Obstetrics and Gynecology Hospital Universitario y Politécnico Valencia Spain
3. Department of Obstetrics and Gynecology Hospital Universitario de Burgos Burgos Spain
4. Department of Obstetrics and Gynecology Hospital Universitario de Valme Sevilla Spain
5. Department of Obstetrics and Gynecology Hospital Universitario de Cruces Bilbao Spain
6. Department of Obstetrics and Gynecology Clinica Universidad de Navarra Pamplona Spain