1 BCNatal Fetal Medicine Research Center (Hospital Clínic and Hospital Sant Joan de Déu), Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), University of Barcelona, Barcelona, Spain.
2 Centre for Biomedical Research on Rare Diseases (CIBER-ER), Barcelona, Spain.
3 Assisted Reproduction Unit, Hospital Clínic of Barcelona, (IDIBAPS), University of Barcelona, Barcelona, Spain.