1. Department of Obstetrics; University Medical Centre Utrecht; Utrecht the Netherlands
2. National Perinatal Epidemiology Unit; University of Oxford; Oxford UK
3. Department of Obstetrics and Gynaecology; Deventer Ziekenhuis; Deventer the Netherlands
4. Institute for Women's Health; University College London; London UK
5. Department of Obstetrics; Leiden University Medical Centre; Leiden the Netherlands
6. Department of Medical Humanities; EMGO Institute for Health and Care Research; VU University Medical Centre; Amsterdam the Netherlands