1. Gynaecology and Obstetrics UPV/EHU, Reproducción Bilbao, Bizkaia, Spain
2. Jiménez Díaz Foundation, Madrid, Spain
3. Vall d’Hebron Hospital, Barcelon, Spain
4. Virgen de las Nieves Hospital, Granada, Spain
5. IVI. Alicante, Spain
6. La Fe Hospital, Valencia, Spain
7. Clínicas Ginemed, Sevilla, Spain
8. Reproduction Unit, Navarre Health Service, Pamplona, Spain