[1] Kings Coll London, Dept Philosophy, London, England
[2] Vrije Univ Amsterdam, Amsterdam Univ Med Ctr UMC, Amsterdam Publ Hlth Res Inst, Dept Midwifery Sci,AVAG, Amsterdam, Netherlands
[3] Univ Nottingham, Sch Hlth Sci, Div Midwifery, Nottingham, England
[4] Maxima Med Ctr, Dept Obstet & Gynaecol, Veldhoven, Netherlands
[5] Radboud Univ Nijmegen, Amalia Childrens Hosp, Med Ctr, Dept Obstet, Nijmegen, Netherlands
[6] Vrije Univ Amsterdam, Amsterdam Univ Med Ctr UMC, Amsterdam Reprod & Dev Res Inst, Dept Midwifery Sci,AVAG, Amsterdam, Netherlands
[7] Univ Groningen, Univ Med Ctr UMC Groningen, Dept Gen Practice & Elderly Med, Midwifery Sci, Groningen, Netherlands
[8] Kings Coll London, Philosophy, London, England