1. Department of Medicine Solna Centre for Pharmacoepidemiology Karolinska Institutet Stockholm Sweden
2. Teratology Information Service HUSLAB and Helsinki University Central Hospital Helsinki Finland
3. Department of Clinical Pharmacology Helsinki University Helsinki Finland
4. Department of Medical Genetics Helsinki University Helsinki Finland
5. Division of Epidemiology Department of Pharmacoepidemiology Norwegian Institute of Public Health Oslo Norway
6. Department of Global Public Health and Primary Care University of Bergen Bergen Norway
7. Nordic School of Public Health Gothenburg Sweden
8. THL National Institute for Health and Welfare Helsinki Finland
9. Department of Clinical Epidemiology Institute of Clinical Medicine Aarhus University Hospital Aarhus Denmark
10. Division of Obstetrics and Gynecology Department of Women's and Children's Health Karolinska Institutet Stockholm Sweden
11. Centre of Public Health Sciences School of Health Sciences University of Iceland Reykjavik Iceland
12. Department of Epidemiology Harvard School of Public Health Boston MA USA