1. Department of Epidemiology Research, Statens Serum Institut, Copenhagen, Denmark
2. Pharmacovigilance Research Center, Department of Drug Design and Pharmacology, University of Copenhagen, Copenhagen, Denmark
3. Department for Congenital Disorders, Statens Serum Institut, Copenhagen, Denmark
4. Department of Neonatology, Copenhagen University Hospital Rigshospitalet, Copenhagen, Denmark
5. The Danish Cancer Society, Copenhagen, Denmark
6. Department of Haematology, Rigshospitalet, Copenhagen, Denmark.
7. Institute of Biomedical Sciences, University of Copenhagen, Copenhagen, Denmark