1. Vascular Biology Research Centre, Molecular and Clinical Sciences Research Institute St George's University of London London UK
2. Fetal Medicine Unit St George's University Hospitals NHS Foundation Trust, University of London London UK
3. Nuffield Department of Primary Care Health Sciences University of Oxford Oxford UK
4. Balliol College University of Oxford Oxford UK
5. Twin and Multiple Births Association (TAMBA) Aldershot UK
6. The Johns Hopkins Center for Fetal Therapy Baltimore MD USA
7. Department of Obstetrics and Gynecology University Hospitals of KU Leuven Leuven Belgium
8. Institute for Women's Health University College London London UK
9. Department of Obstetrics and Fetal Medicine University Medical Center Hamburg‐Eppendorf Neues Klinikum Hamburg Germany
10. Department of Pediatrics Leiden University Medical Center Leiden The Netherlands
11. Division of Fetal Medicine, Department of Obstetrics Leiden University Medical Center Leiden The Netherlands
12. Fetal Medicine Unit, Department of Obstetrics and Gynaecology St George's University Hospitals NHS Foundation Trust London UK
13. Neonatal Unit, St George's University Hospitals NHS Foundation Trust London UK
14. West Middlesex University Hospital and Chelsea Westminster Hospital NHS Foundation Trust Isleworth UK
15. Lewisham and Greenwich NHS Trust, Queen Elizabeth Hospital London UK