1. Department for Health Evidence; Radboud University Nijmegen Medical Centre; Nijmegen; the Netherlands
2. Department of Genetics; EUROCAT Registration of Congenital Anomalies; University Medical Centre Groningen; Groningen; the Netherlands
3. Department of Human Genetics; Radboud University Nijmegen Medical Centre; Nijmegen; the Netherlands
4. Division of Medical Genetics; CHUV; Lausanne; Switzerland
5. Department of Paediatrics; Childrens Hospital Zagreb; University Hospital Center Sisters of Mercy; Zagreb; Croatia
6. Department of Hungarian Congenital Abnormality Registry and Surveillance; National Institute for Health Development; Budapest; Hungary
7. Department of Medical Genetics; ISMAC Registry; ARNAS Garibaldi Nesima; Catania; Italy
8. Unit of Epidemiology; IFC CNR; Tuscany Registry of Birth Defects; Pisa; Italy
9. Department of Medical Genetics; IMER Register; University of Ferrara; Ferrara; Italy
10. EUROCAT Central Registry; University of Ulster; Northern Ireland; UK
11. Paris Registry of Congenital Malformations; INSERM UMR S 953; Hôpital Saint Vincent de Paul; Paris; France
12. Department of Medical Genetics; Poznan University of Medical Sciences; Wielkopolska; Poland
13. Department of Epidemiology; National Institute of Health; Lisbon; Portugal
14. Health Service Executive; Dr Steevens Hospital; Dublin; Ireland
15. Department of Public Health; Health Service Executive South (South East); Kilkenny; Ireland
16. Department of Environment; Province of Antwerp; Antwerp; Belgium
17. Department of Public Health; Health Service Executive South; Cork & Kerry; Ireland
18. Birth Registry Mainz Model; Children's Hospital; University Medical Center of the Johannes Gutenberg University; Mainz; Germany
19. Institute of Health & Society; Newcastle University; Newcastle; UK
20. OMNI-Net Ukraine; Khmelnytsky; Ukraine