1. Department of Primary and Long-term Care, University of Groningen, University Medical Center Groningen , Groningen, The Netherlands
2. Midwifery Academy Amsterdam Groningen, InHolland , Groningen, The Netherlands
3. Amsterdam UMC Location Vrije Universiteit Amsterdam, Midwifery Science , Amsterdam, The Netherlands
4. Department of Sociology and Interuniversity Center for Social Science Theory and Methodology (ICS), University of Groningen , Groningen, The Netherlands
5. Department of Epidemiology, University of Groningen, University Medical Center Groningen , Groningen, The Netherlands
6. Department of Obstetrics and Gynecology, University of Groningen, University Medical Center Groningen , Groningen, The Netherlands