1. Department of Epidemiology; Care and Public Health Research Institute (CAPHRI); Maastricht University; Maastricht The Netherlands
2. Department of Obstetrics and Gynecology; School for Oncology and Developmental Biology (GROW); Maastricht University Medical Center; Maastricht The Netherlands
3. Department of Clinical Epidemiology and Medical Technology Assessment (KEMTA); Care and Public Health Research Institute (CAPHRI); Maastricht University Medical Center; Maastricht The Netherlands
4. Department of Obstetrics and Gynecology; Zuyderland Medical Center; Heerlen The Netherlands
5. Department of Obstetrics and Gynecology; Sint Jans Gasthuis Weert; Weert The Netherlands
6. Department of Obstetrics and Gynecology; Laurentius Hospital; Roermond The Netherlands