1. Department of Obstetrics and Gynecology Isala Hospital Zwolle The Netherlands
2. Department of Obstetrics and Gynecology University Medical Center Groningen University of Groningen Groningen The Netherlands
3. Department of Research & Development Netherlands Comprehensive Cancer Organization Utrecht The Netherlands
4. Department of Pathology and Medical Biology University of Groningen University Medical Center Groningen Groningen The Netherlands
5. Department of Obstetrics and Gynecology Maastricht University Medical Center Maastricht The Netherlands
6. GROW ‐ School for Oncology and Reproduction University of Maastricht Maastricht The Netherlands