1Department of Social and Preventive Medicine.
2Department of Obstetrics and Gynaecology, University of Helsinki and Helsinki University Central Hospital, Helsinki, and
3Harris Birthright Research Centre of Fetal Medicine, King's College Hospital, London, UK
4Department of Molecular Biology, Medical Biochemistry and Pathology, Faculty of Medicine, Université Laval, Quebec City, Que., Canada
5Kanta-Häme Central Hospital, Hämeenlinna, Finland
6Hassiba Ben Bouali Clinic, Centre Hospitalo-Universitaire de Blida, Blida, Algeria
7Fetal Medicine Unit and Department of Obstetrics and Gynecology, Cairo University, Cairo, Egypt
8Department of Obstetrics and Gynecology, and