1. Institute for Virology, University Hospital Essen, University of Duisburg-Essen, Essen, Germany.
2. Institute for Experimental Immunology and Imaging, University Hospital Essen, University of Duisburg-Essen, Essen, Germany.
3. Department of Infectious Diseases, Union Hospital of Tongji Medical College, Huazhong University of Science and Technology, Wuhan, P.R. China.