1. Department of Obstetrics and Gynaecology, Queen Charlotte’s and Chelsea Hospital, London, UK
2. Section of Investigative Medicine, Imperial College London, London, UK, and Department of Gynaecology, St Mary’s Hospital, London, UK
3. Department of Gynaecology, St Mary’s Hospital, London, UK
4. Section of Investigative Medicine, 6th Floor Commonwealth Building, Imperial College Faculty of Medicine, Hammersmith Hospital, Du Cane Road, London W120NN, UK