1. Department of Hematopoiesis Sanquin Research and Landsteiner Laboratory Amsterdam UMC University of Amsterdam Amsterdam The Netherlands
2. Department of Experimental Immunology Amsterdam UMC University of Amsterdam Amsterdam The Netherlands
3. Viral Immunobiology University of Zurich Zurich Switzerland
4. Department of Public and Global Health Epidemiology Biostatistics and Prevention Institute University of Zurich Zurich Switzerland
5. Department of Infectious Diseases and Hospital Epidemiology University Hospital Zurich Switzerland