1. Department of Obstetrics and Gynaecology, University of Groningen, University Medical Centre Groningen, Groningen, The Netherlands
2. Department of Obstetrics and Gynaecology, GROW School for Oncology and Developmental Biology, Maastricht University Medical Centre, Maastricht, The Netherlands
3. Department of Obstetrics and Gynaecology, Medical Centre Leeuwarden, Leeuwarden, The Netherlands
4. Department of Obstetrics and Gynaecology, Wilhelmina Hospital Assen, Assen, The Netherlands
5. Department of Obstetrics and Gynaecology, Treant Zorggroep, Scheper Hospital, Emmen, The Netherlands
6. Institute for Public Health Genomics, Department of Genetics and Cell Biology, GROW School for Oncology and Developmental Biology, Faculty of Health, Medicine & Life Sciences, University of Maastricht, Maastricht, The Netherlands