1. Department of Infectious Disease Epidemiology and Prevention, Statens Serum Institut, Copenhagen, Denmark
2. Department of Data Integration and Analysis, Statens Serum Institut, Copenhagen, Denmark
3. Department of Gynaecology and Obstetrics, Odense University Hospital, Odense, Denmark
4. Department of Virus and Microbiological Special Diagnostics, Statens Serum Institut, Copenhagen, Denmark
5. Department of Gynaecology and Obstetrics, Aarhus University Hospital, Aarhus, Denmark
6. Infectious Disease Preparedness, Statens Serum Institut, Copenhagen, Denmark