1. Nuffield Department of Obstetrics and Gynaecology; University of Oxford; The Women's Centre; John Radcliffe Hospital; Oxford UK
2. School of Clinical Medicine; Faculty of Health Sciences; University of the Witwatersrand; Johannesburg South Africa
3. Department of Obstetrics & Gynaecology; The Women's Centre; John Radcliffe Hospital; Oxford University Hospitals NHS Trust; Oxford UK
4. Fetal and Maternal Medicine; The Women's Centre; John Radcliffe Hospital; Oxford University Hospitals NHS Trust; Oxford UK