1. Department of Obstetrics and Gynaecology, Erasmus MC, University Medical Centre Rotterdam , Rotterdam, The Netherlands
2. Department of Quality of Care and Health Economics, Center of Prevention, Nutrition and Health Services Research, National Institute for Public Health and the Environment , Bilthoven, The Netherlands
3. Division of Neonatology, Department of Neonatal and Paediatric Intensive Care, Erasmus MC Sophia Children’s Hospital, University Medical Centre Rotterdam , Rotterdam, The Netherlands
4. Department of Public Health, Erasmus MC, University Medical Centre Rotterdam , Rotterdam, The Netherlands
5. Department of Public Health and Primary Care, Leiden University Medical Center , The Hague, The Netherlands