1. Department of Virus and Microbiological Special Diagnostics, Statens Serum Institut , Copenhagen
2. Department of Clinical Research, Nordsjællands Hospital , Hilleroed
3. Department of Science and Environment, Roskilde University
4. Neonatal Genetics, Statens Serum Institut , Copenhagen , Denmark
5. Oxford Vaccine Group, Department of Pediatrics, University of Oxford and National Institute for Health and Care Research Oxford Biomedical Research Centre , United Kingdom
6. Department of Public Health, University of Copenhagen , Denmark