1 Department of Obstetrics and Gynecology, Koc University School of Medicine, Istanbul, Turkey.
2 Department of Women and Children's Health, School of Life Course Sciences, King's College London, London, UK.
3 Paediatric Infectious Diseases Research Group and Vaccine Institute, Institute of Infection and Immunity, St George's University of London, London SW17 0QT, UK.
4 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, London SW17 0QT, UK. Electronic address: akhalil@sgul.ac.uk.