1. IMER Registry‐ Azienda Ospedaliero‐Universitaria di Ferrara Italy
2. Children's Hospital ZagrebMedical School University of Zagreb Croatia
3. EUROCAT Central RegistryCentre for MaternalFetal and Infant Research, University of UlsterNewtownabbey United Kingdom
4. Wolfson Institute of Preventive MedicineQueen Mary University of London United Kingdom
5. University Hospitals Southampton Faculty of Medicine and Wessex Clinical Genetics ServicePrincess Anne HospitalSouthampton United Kingdom
6. Division of Medical GeneticsLausanne Switzerland
7. Public Health Division of GipuzkoaInstituto BIO‐DonostiaBasque Government, CIBER Epidemiología y Salud Pública ‐ CIBERESP Spain
8. CNR Institute of Clinical Physiology and G. Monasterio Tuscany FoundationPisa Italy
9. Department of Health SciencesUniversity of Leicester United Kingdom
10. Medical Birth Registry of NorwayNorwegian Institute of Public Health and Department of Global Public Health and Primary CareUniversity of Bergen Norway
11. INSERM U953Paris France
12. Health Service ExecutiveDublin Ireland
13. Provincial Institute for HygieneAntwerp Belgium
14. University Medical Center of the Johannes Gutenberg UniversityMainz Germany
15. Institute of Health & Society Newcastle UniversityNewcastle upon Tyne United Kingdom
16. Malformation Monitoring Centre Saxony‐AnhaltMedical Faculty Otto‐von‐Guericke UniversityMagdeburg Germany
17. National Perinatal Epidemiology UnitUniversity of Oxford United Kingdom
18. Public HealthWales United Kingdom
19. Institut de Pathologie et de GénétiqueCharleroi Belgium
20. University of GroningenUniversity Medical Center Groningen The Netherlands
21. Pediatric DepartmentHospital LillebaeltKolding Denmark