Aarhus University - Department of Clinical Immunology, Statens Serum Institut, Aarhus University - Department of Clinical Immunology, Aarhus University - Department of Clinical Immunology, Aarhus University - Department of Clinical Immunology, Aarhus University - Department of Clinical Immunology, Aarhus University - Department of Clinical Immunology, Aarhus University - Department of Clinical Immunology, Statens Serum Institut - Infectious Disease Epidemiology & Prevention, Odense University Hospital - Department of Clinical Immunology, Odense University Hospital - Department of Clinical Immunology, University of Copenhagen - Department of Clinical Immunology, University of Copenhagen - Department of Clinical Immunology, Zealand University Hospital - Department of Clinical Immunology, University of Copenhagen - Department of Clinical Immunology, Zealand University Hospital - Department of Clinical Immunology, University of Copenhagen - Department of Clinical Immunology, University of Copenhagen - Department of Clinical Immunology, Aalborg University Hospital - Department of Clinical Immunology, Aarhus University - Department of Clinical Immunology, Vitalant Research Institute, Statens Serum Institut, Statens Serum Institut, Statens Serum Institut, University of Copenhagen - Department of Clinical Medicine, Statens Serum Institut - Infectious Disease Epidemiology & Prevention and Zealand University Hospital - Department of Clinical Immunology