1. KNOV (Royal Dutch Organisation for Midwives); Utrecht
2. The Netherlands Perinatal Registry; Utrecht
3. Department of Midwifery Science; AVAG and the EMGO Institute of Health and Care Research; VU University Medical Center; Amsterdam
4. TNO; Leiden
5. Faculty of Social Sciences; Radboud University; Nijmegen
6. Gender& Women's Health; Radboud University Nijmegen Medical Centre; Department of Primary and Community Care