1. Amsterdam UMC Location Vrije Universiteit Amsterdam, Midwifery Science Amsterdam The Netherlands
2. Midwifery Academy Amsterdam Groningen, InHolland Amsterdam The Netherlands
3. Amsterdam Public Health, Quality of Care Amsterdam The Netherlands
4. Department of General Practice & Elderly Care Medicine University of Groningen, University Medical Center Groningen Groningen The Netherlands
5. Verloskundigen Buitenwatersloot (Midwifery Practice) Delft The Netherlands
6. Department of Obstetrics and Gynaecology Amalia Children's Hospital, Radboud University Medical Centre Nijmegen The Netherlands
7. Het Buikencollectief Heemstede The Netherlands
8. Amsterdam Reproduction and Development Amsterdam The Netherlands
9. Division of Midwifery, School of Health Sciences University of Nottingham Nottingham UK