1. These authors contributed equally to this work
2. Institute of Virology, University of Bonn Medical Centre, Bonn, Germany
3. Ruhrlandklinik, University of Duisburg-Essen, Essen, Germany
4. Institute of Virology, University of Duisburg-Essen, Essen, Germany
5. Robert Koch Institute, Berlin, Germany
6. Euroimmun AG, Lübeck, Germany
7. TibMolbiol, Berlin, Germany
8. Virosciences Laboratory, Erasmus MC, Rotterdam, the Netherlands