Affiliation: | University of Bristol Department of Obstetrics and Gynaecology, Bristol Maternity Hospital, Bristol BS2 8EG, Research Registrar; University of Bristol Department of Obstetrics and Gynaecology, Bristol Maternity Hospital, Bristol BS2 8EG, Chief Technician; University of Bristol Department of Obstetrics and Gynaecology, Bristol Maternity Hospital, Bristol BS2 8EG, Reader and Consultant |