1. Department of Obstetrics and Gynaecology; & EMGO Institute for Health and Care Research; AMC-UMCG-UWV-VUmc; Amsterdam the Netherlands
2. Department of Public and Occupational Health; & EMGO Institute for Health and Care Research; AMC-UMCG-UWV-VUmc; Amsterdam the Netherlands
3. Research Centre for Insurance Medicine; AMC-UMCG-UWV-VUmc; Amsterdam the Netherlands
4. Department of Epidemiology and Biostatistics; VU University Medical Centre; Amsterdam the Netherlands
5. Department of Obstetrics and Gynaecology; Flevo Hospital; Almere the Netherlands
6. Department of Obstetrics and Gynaecology; Onze Lieve Vrouwe Gasthuis; Amsterdam the Netherlands