1. Fetal Medicine Unit, St George's Hospital, St George's University of London London UK
2. Vascular Biology Research Centre Molecular and Clinical Sciences Research Institute, St George's University of London London UK
3. The Royal College of Obstetricians and Gynaecologists London UK
4. Department of Women's and Children's Health Karolinska Institutet Stockholm Sweden
5. Astrid Lindgren Children's Hospital Karolinska University Hospital Stockholm Sweden
6. FUTURE, Center for Functional Tissue Reconstruction University of Oslo Oslo Norway
7. Department of Gynecology and Obstetrics, Ribeirão Preto Medical School University of São Paulo São Paulo Brazil
8. Paediatric Infectious Diseases Research Group and Vaccine Institute, Institute of Infection and Immunity, St George's University of London London UK
9. Immunisation and Countermeasures Division, UK Health Security Agency UK