1. Department of Pharmacy and Pharmacology; University of Bath; Bath UK
2. Paediatric department; Hospital Lillebaelt; Kolding Denmark
3. Pharmacoepidemiology and Pharmacoeconomics unit, Department of Pharmacy; University of Groningen; Groningen The Netherlands
4. Medical Birth Registry of Norway; The Norwegian Institute of Public Health; Bergen Norway
5. Department of Global Public Health and Primary Care; University of Bergen; Bergen Norway
6. Department of Nursing, College of Human and Health Sciences; Swansea University; Swansea Wales UK
7. IMER (Emilia Romagna Registry of Birth Defects); Azienda Ospedaliero-Universitaria di Ferrara; Ferrara Italy
8. Institute of Clinical Physiology - National Research Council (IFC-CNR); Pisa Italy
9. Section of Social Medicine, Department of Public Health; University of Copenhagen; Copenhagen Denmark
10. Department of Pharmacoepidemiology; The Norwegian Institution of Public Health; Oslo Norway
11. The Regional Agency for Public Health of Tuscany; Tuscany Italy
12. Centre for Health Information, Research and Evaluation; Swansea University; Swansea Wales UK
13. Drug Policy Service; Emilia Romagna Region Health Authority; Bologna Italy
14. Institute of Nursing; University of Ulster; Ulster Northern Ireland United Kingdom