1. Children's Hospital Zagreb, Clinical Hospital Centre Sisters of Charity, Medical School University of Zagreb; Zagreb; Croatia
2. EUROCAT Central Registry, Centre for Maternal, Fetal and Infant Research, University of Ulster; Newtownabbey; United Kingdom
3. Pediatric Department; Hospital Lillebaelt; Kolding; Denmark
4. University Hospitals Southampton Faculty of Medicine and Wessex Clinical Genetics Service, Princess Anne Hospital; Southampton; United Kingdom
5. Istituto di Genetica Medica, University of Ferrara; Ferrara; Italy
6. Division of Medical Genetics; Lausanne; Switzerland
7. Public Health Division of Gipuzkoa; Instituto BIO-Donostia, Basque Government, CIBER Epidemiología y Salud Pública-CIBERESP; Gipuzkoa; Spain
8. University of Groningen, University Medical Center Groningen; Groningen; The Netherlands
9. Registro ISMAC; Catania; Italy
10. National Perinatal Epidemiology Unit; University of Oxford; Oxford; United Kingdom
11. Department of Health Sciences; University of Leicester; Leicester; United Kingdom
12. Department of Health Information and Research; Gardamangia; Malta
13. Medical University of Graz; Graz; Austria
14. INSERM U953; Paris; France
15. Department of Medical Genetics; Poznan University of Medical Sciences; Poznan; Poland
16. Health Service Executive; Dublin; Ireland
17. CNR Institute of Clinical Physiology; Pisa; Italy
18. Institute of Health and Society Newcastle University; Newcastle upon Tyne; United Kingdom
19. Medical Faculty; Malformation Monitoring Centre Saxony-Anhalt; Magdeburg; Germany
20. University Medical Center of the Johannes Gutenberg University; Mainz; Germany
21. Institut de Pathologie et de Génétique; Charleroi; Belgium
22. Paediatric Epidemiology & Community Health (PEACH) Unit; Yorkhill Hospital, University of Glasgow; Glasgow; United Kingdom
23. Genetica Medica, Dip. Pediatria; Padova; Italy