1. Department of Epidemiology Care and Public Health Research InstituteMaastricht University Maastricht The Netherlands
2. Department of Obstetrics and Gynecology School for Oncology and Developmental Biology Maastricht University Medical Center Maastricht The Netherlands
3. Department of Obstetrics and Gynecology Sint Jans Gasthuis Weert Weert The Netherlands
4. Department of Development and Regeneration KU Leuven Leuven Belgium
5. Department of Obstetrics and Gynecology Zuyderland Medical Center Heerlen The Netherlands
6. Department of Obstetrics and Gynecology Laurentius Hospital Roermond The Netherlands