1. Department of Maternal-Fetal Medicine; Institute of Gynecology, Obstetrics and Neonatology, Hospital Clinic of Barcelona; Catalonia Spain
2. Leiden University Medical Center; Department of Obstetrics and Fetal Medicine; Leiden The Netherlands
3. Department of Obstetrics & Gynecology; Stanford University School of Medicine; Stanford CA USA
4. Elliot Health System; Manchester NH USA
5. Department of Obstetrics & Gynecology, Division of Maternal Fetal Medicine; University of South Florida; Tampa FL USA