1. Department of Obstetrics and Gynecology Royal Free Hospital NHS Trust London UK
2. EGA Institute for Women’s Health University College London London UK
3. National Heart and Lung Institute Imperial College London London UK
4. Barts and the London School of Medicine and Dentistry Queen Mary University of London London UK
5. Department of Obstetrics and Gynecology Yong Loo Lin School of MedicineNational University of Singapore Singapore