1. Buckinghamshire Hospitals NHS Trust; Aylesbury UK
2. Discipline of Obstetrics and Gynaecology, School of Medicine, Robinson Research Institute; The University of Adelaide; Adelaide Australia
3. Faculty of Medicine; University of Maastricht; Maastricht Netherlands
4. Obstetrics and Gynecology; University of Gothenburg; Gothenburg Sweden
5. Department of Obstetrics and Gynaecology; Monash University; Clayton Australia
6. Nuffield Department of Women's & Reproductive Health; University of Oxford; Oxford UK