1. Department of Medicine and Surgery, Obstetrics and Gynaecology Unit University of Parma Parma Italy
2. Department of Metabolism, Digestion and Reproduction Institute of Reproductive and Developmental Biology, Imperial College London London UK
3. Department of Obstetrics and Gynaecology, IRCCS Fondazione Policlinico San Matteo University of Pavia Pavia Italy
4. Centre for Fetal Care, Department of Obstetrics and Gynaecology Queen Charlotte's and Chelsea Hospital, Imperial College Healthcare NHS Trust London UK