1 Department of Paediatric Immunology and Infectious Diseases, Wilhelmina Children's Hospital, University Medical Centre Utrecht, Utrecht, the Netherlands.
2 Department of Microbiology, Immunology and Transplantation, Laboratory of Clinical and Epidemiological Virology, Leuven, Belgium, Spatial Epidemiology Lab (SpELL), Université Libre de Bruxelles, Bruxelles, Belgium.
3 Department of Medical Microbiology, University Medical Centre Utrecht, Utrecht, the Netherlands.
4 Department of Global Health, Boston University School of Public Health, Boston, Massachusetts.
5 Department of Microbiology, Immunology and Transplantation, Laboratory of Clinical and Epidemiological Virology, Leuven, Belgium.