1. Department of Infectious Diseases, University Hospital Essen, University Duisburg-Essen, Essen, Germany
2. Institute for Transfusion Medicine, University Hospital Essen, University Duisburg-Essen, Essen, Germany
3. Department of Dermatology, Venereology and Allergology, University Hospital Essen, University Duisburg-Essen, Essen, Germany
4. Institute for Virology, University Hospital Essen, University Duisburg-Essen, Essen, Germany