1. Department of Infectious Disease Epidemiology and Modelling, Norwegian Institute of Public Health, Oslo
2. Department of Microbiology and Infection Control, Akershus University Hospital, Lørenskog
3. Department of Vaccine Preventable Diseases, Norwegian Institute of Public Health, Oslo
4. Department of Natural Sciences and Health, Oslo Metropolitan University, Oslo
5. Centre for Fertility and Health, Norwegian Institute of Public Health, Oslo
6. Center for Laboratory Medicine, Østfold Hospital Trust, Grålum, Norway