1. Department of Obstetrics and Gynecology, Faculty of Medicine in Hradec Kralove, University Hospital in Hradec Králové, Charles University, Hradec Králové, Czech Republic;
2. Biomedical Research Center, University Hospital Hradec Králové, Hradec Králové, Czech Republic;
3. Department of Dentistry, Faculty of Medicine in Hradec Kralove, University Hospital in Hradec Králové, Charles University, Hradec Králové, Czech Republic;
4. Department of Clinical Immunology and Allergy, Faculty of Medicine in Hradec Kralove, University Hospital in Hradec Králové, Charles University, Hradec Králové, Czech Republic;
5. Department of Congenital disorders, Center for Neonatal Screening, Statens Serum Institut, Copenhagen, Denmark;
6. Department of Obstetrics and Gynecology, Gothenburg University, Gothenburg, Sweden;
7. Department of Genes and Environment, Division of Epidemiology, Norwegian Institute of Public Health, Oslo, Norway