title: Reply.
authors.affiliation: Nuffield Department of Obstetrics and Gynaecology, John Radcliffe Hospital, Oxford, United Kingdom. Electronic address: Christopher.Redman@obs-gyn.ox.ac.uk.
authors.forename: Christopher W
authors.initials: CW
authors.lastname: Redman
authors.affiliation: Faculty of Medicine, University of Oslo, Department of Obstetrics and Department of Gynecology, Oslo University Hospital, Oslo, Norway.
authors.forename: Anne Cathrine
authors.initials: AC
authors.lastname: Staff