1. Centre for Maternal Fetal and Infant Research; University of Ulster; Newtownabbey; UK
2. Centre for Intellectual and Developmental Disabilities; University of Ulster; Newtownabbey; UK
3. Hospital Lillebaelt; Kolding; Denmark
4. Division of Medical Genetics; Lausanne; Switzerland
5. Eurocat Northern Netherlands; Department of Genetics; University of Groningen; University Medical Center; Groningen; The Netherlands
6. National Perinatal Epidemiology Unit; University of Oxford; Oxford; UK
7. Department of Health Information and Research; Guardamangia; Malta
8. Medical University of Graz; Austria
9. Medical Birth Registry of Norway; Bergen; Norway
10. Polish Registry of Congenital Malformations; Poznan; Poland
11. Paris Registry of Congenital Malformations; INSERM U953; Paris; France
12. Health Service Executive; Dublin; Ireland
13. National Institute of Health Development; Department of Hungarian Congenital Abnormality Registry & Surveillance; Budapest; Hungary
14. Health Service Executive; Kilkenny; Ireland
15. Provinciaal Insituut voor Hygiene; Antwerp; Belgium
16. Health Service Executive; Cork; Ireland
17. CNR Institute of Clinical Physiology; Pisa; Italy
18. Institute of Health and Society; Newcastle University; Newcastle upon Tyne; UK
19. Malformation Monitoring Centre Saxony-Anhalt; Medical Faculty Otto-von-Guericke University; Magdeburg; Germany
20. Public Health Wales; Wales; UK
21. Faculty of Medicine; University of Southampton and Wessex Clinical Genetics Service; Southampton; UK