1. Department of Obstetrics and Gynaecology; Ghent University Hospital; Ghent Belgium
2. Department of Obstetrics and Gynaecology; Birth Centre Wilhelmina's Children Hospital; Devision Woman and Baby; University Medical Centre Utrecht; Utrecht the Netherlands
3. Centre for Quality and Management in Health Care; Medical Association of Lower Saxony; Hannover Germany
4. Department of Obstetrics; Rigshospitalet; University Hospital of Copenhagen; Copenhagen Denmark
5. Obstetrical, Perinatal and Paediatric Epidemiology Research Team; Centre for Epidemiology and Statistics Sorbonne Paris Cité; Inserm U1153; Paris Descartes University; Paris France
6. Information Services Department; THL National Institute for Health and Welfare; Helsinki Finland
7. Department of Neurobiology, Care Sciences and Society; Division of Family Medicine; Karolinska Institute; Stockholm Sweden
8. National Perinatal Epidemiology Unit; University of Oxford; Oxford UK
9. Department of Clinical Science Intervention and Technology (CLINTEC); Karolinska Institute; Stockholm Sweden
10. Department of Obstetrics and Gynecology; Sodersjukhuset; Stockholm Sweden
11. Department of Clinical Epidemiology; Tirol Kliniken Ltd.; Innsbruck Austria
12. Department of Public Health, Health Services Research and Health Technology Assessment; Institute of Public Health, Medical Decision Making and Health Technology Assessment; UMIT - University for Health Sciences, Medical Informatics and Technology; Hall in Tirol Austria
13. Athena Institute; VU University Amsterdam; Amsterdam the Netherlands
14. Department of Obstetrics; Leiden University Medical Centre; Leiden the Netherlands
15. Department of Obstetrics and Gynaecology; Deventer Hospital; Deventer the Netherlands