Janneke gitsels (Midwifery Science, AVAG, Amsterdam Public Health research institute, VU University Medical Center, Amsterdam), Linda Martin (Midwifery Science, AVAG, Amsterdam Public Health research institute, VU University Medical Center, Amsterdam, the Netherlands), Lisanne Gitsels (the School of Computing Sciences, University of East Anglia, Norwich, England), Esther Feijen-de Jong (1Department of Midwifery Science Groningen, AVAG, Amsterdam Public Health research institute, VU University Medical Center, Amsterdam-Groningen, the Netherlands), Britte Van Weert (Verloskundigenpraktijk Lavita)