1 Fetal Medicine Unit, St George's Hospital, St George's University of London, London SW17 0QT, UK; Vascular Biology Research Centre, Molecular and Clinical Sciences Research Institute, St George's University of London, UK; The Royal College of Obstetricians and Gynaecologists, London, UK. Electronic address: akhalil@sgul.ac.uk.
2 Karolinska Institute, Stockholm, Sweden; Department of Women's and Children's Health, Astrid Lindgren Children's Hospital, Karolinska University Hospital, Stockholm, Sweden; FUTURE, Center for functional tissue reconstruction, University of Oslo, Oslo, Norway.
3 Division of Women's Health, University College London Hospitals NHS Foundation Trust, London, UK.
4 Department of Gynecology and Obstetrics, Ribeirão Preto Medical School, University of São Paulo, São Paulo, Brazil.
5 Paediatric Infectious Diseases Research Group and Vaccine Institute, Institute of Infection and Immunity, St George's University of London, London, UK; Immunisation and Countermeasures Division, UK Health Security Agency, London, UK.