1. Centre for Medical Genetics, Universitair Ziekenhuis Brussel (UZ Brussel), Laarbeeklaan 101, 1090 Brussels, Belgium
2. Department of Anatomical Research and Clinical Studies, Vrije Universiteit Brussel, Laarbeeklaan 103, 1090 Brussels, Belgium
3. Department of Obstetrics and Gynaecology, Academic Medical Centre, Meibergdreef 9, 1105 AZ Amsterdam, Netherlands
4. Centre for Reproductive Medicine, Universitair Ziekenhuis Brussel (UZ Brussel), Laarbeeklaan 101, 1090 Brussels, Belgium
5. Environment and Health/Youth Health Care, Department of Public Health and Primary Care, Kapucijnenvoer 35, 3000 Leuven, Belgium
6. Pediatric Endocrinology, Universitair Ziekenhuis Brussel (UZ Brussel), Laarbeeklaan 101, 1090 Brussels, Belgium