Affiliation: | Academic Unit of Obstetrics &Gynaecology, St James's University Hospital, Leeds;Mayday University Hospital, Mayday Road, Croydon;Queen Charlotte's &Chelsea Hospital, London;Department of Obstetrics &Gynaecology, St Michael's Hospital, Bristol;Academic Department of Obstetrics &Gynaecology, Birmingham Maternity Hospital, Edgbaston, Birmingham, UK |