1 Research Institute of Midwifery and Reproductive Health, School of Health Sciences, ZHAW Zurich University of Applied Sciences, Winterthur, Switzerland. Electronic address: susanne.grylka@zhaw.ch.
2 Centre for Midwifery, & Women's Health, Bournemouth University, England, UK.
3 Midwifery and Allied Health Professions Research Unit, University of Stirling, Scotland, UK.
4 Midwifery Research and Education Unit, Hannover Medical School, Hannover, Germany.
5 School of Population and Public Health, University of British Columbia, Canada.
6 School of Health Sciences, University of Nottingham, UK.