1. Department of Health Sciences, Global Health Unit University Medical Center Groningen & University of Groningen Groningen the Netherlands
2. Department of Obstetrics and Gynecology Erasmus University Medical Center Rotterdam The Netherlands
3. Department of Obstetrics and Gynecology Hospital Twente ZGT/MST Enschede The Netherlands
4. Department of Obstetrics and Gynecology University Medical Center Groningen, University of Groningen Groningen the Netherlands
5. Department of General Practice & Elderly Care Medicine University of Groningen, University Medical Center Groningen Groningen the Netherlands
6. Midwifery Academy Amsterdam Groningen Groningen the Netherlands