1. Imperial College NHS Healthcare Trust, Queen Charlotte’s Hospital, London, UK
2. Institute for Reproductive Development and Biology, Imperial College London, London, UK
3. Obstetrics and Gynaecology Department, Northwick Park NHS Trust, London, UK
4. Chelsea and Westminster NHS Hospital, London, UK
5. Obstetrics & Gynaecology Department, North Middlesex University Hospital, London, UK
6. Imperial College NHS Healthcare Trust, Charing Cross Hospital, London, UK
7. The Centre for Reproductive and Genetic Health, London, UK