1. Department of Medical Oncology and Hematology University Hospital Zürich Zürich Switzerland
2. Department of Hematology, Oncology, Clinical Immunology and Rheumatology University Hospital Tübingen Tübingen Germany
3. Infection Biology Laboratory, Department of Biomedicine University of Basel Basel Switzerland
4. Department of Pathology and Molecular Pathology University Hospital Zürich Zürich Switzerland
5. Department of Infectious Diseases and Hospital Epidemiology University Hospital Zürich Zürich Switzerland
6. Institute of Medical Virology University of Zürich Zürich Switzerland
7. Division of Infectious Diseases and Hospital Epidemiology University and University Hospital Basel Basel Switzerland