1 Fetal Medicine Unit, Careggi University Hospital, Florence, Italy.
2 Department of Metabolism, Digestion and Reproduction, Faculty of Medicine, Imperial College London, London, United Kingdom.
3 Centre for Fetal Care, Queen Charlotte's and Chelsea Hospital, Imperial College Healthcare, London, United Kingdom.
4 Division of Experimental Medicine and Immunotherapeutics, Department of Medicine, University of Cambridge, Cambridge, United Kingdom.
5 Division of Obstetrics and Gynaecology, Department of Surgery, University of Rome, Policlinico Casilino, Tor Vergata, Rome, Italy.
6 Department of Obstetrics and Gynaecology, Ziekenhuis Oost Limburg, Genk, Belgium; Department of Physiology, Hasselt University, Diepenbeek, Belgium.
7 Centre for Fetal Care, Queen Charlotte's and Chelsea Hospital, Imperial College Healthcare, London, United Kingdom; Institute for Reproductive and Developmental Biology, Department of Metabolism, Digestion and Reproduction, Imperial College London, London, United Kingdom; Department of Development of Regeneration, Katholieke Universiteit Leuven, Leuven, Belgium. Electronic address: c.lees@imperial.ac.uk.