1. Department of Obstetrics and Gynaecology, Division of Woman and Child; University Hospitals Leuven; Leuven; Belgium
2. Hospital Clinic-IDIBAPS; University of Barcelona and CIBER-ER; Barcelona; Spain
3. Harris Birthright Research Centre for Fetal Medicine; King's College Hospital, London; UK
4. Department of Neonatology, Division of Woman and Child; University Hospitals Leuven; Leuven; Belgium