1. Centre for Reproductive Medicine, Universitair Ziekenhuis Brussel, Vrije Universiteit Brussel, Laarbeeklaan 101-1090 Brussels, Belgium
2. Academic Unit of Obstetrics and Gynecology, IRCCS AOU San Martino–IST, University of Genova, Largo R. Benzi 10, 16132 Genova, Italy
3. Department of Obstetrics, Gynaecology and Reproductive Medicine, Santa Maria University Hospital, Avenida Professor Egas Moniz, Lisbon 1649-035, Portugal
4. Faculty of Medicine and Pharmacy, Department of Surgical and Clinical Science, Vrije Universiteit Brussel, Laarbeeklaan 101-1090 Brussels, Belgium
5. Department of Obstetrics & Gynaecology, School of Medicine, University of Zagreb, Petrova 13, 10000 Zagreb, Croatia