1. Fetal Medicine Department; Rosie Hospital, Addenbrooke's Hospital; Cambridge University Hospitals NHS Foundation Trust; Cambridge CB2 2QQ UK
2. Clinical Pharmacology Unit; University of Cambridge; Cambridge CB2 0QQ UK
3. Department of Haematology; University of Cambridge; Cambridge CB2 0PT UK
4. National Health Service Blood and Transplant; Cambridge CB2 0PT UK
5. Department of Cardiovascular Sciences; University of Leicester and NIHR Cardiovascular Biomedical Research Unit; Glenfield Hospital; Leicester LE3 9QP UK
6. Centre for Fetal Care; Queen Charlotte's and Chelsea Hospital; Imperial Healthcare NHS Trust; London W12 0HS UK
7. Department of Development and Regeneration; University Hospitals Leuven; Leuven B-3000 Belgium