1. Department of Gynecology, Vrije Universiteit Brussel (VUB), Universitair Ziekenhuis Brussel (UZBrussel), Brussels, Belgium
2. Department of Fertility, Vrije Universiteit Brussel (VUB), Universitair Ziekenhuis Brussel (UZBrussel), Brussels, Belgium
3. Department of Fertility, Dexeus University Hospital, Barcelona, Spain