1. Virology and Microbiology, Center for Biomedical Education and Research (ZBAF), School of Medicine, Faculty of Health, Witten/Herdecke University, Witten, Germany
2. Department of Biochemistry, University of Zurich, Zurich, Switzerland
3. Institute of Physiology, Pathophysiology, and Toxicology, Center for Biomedical Training and Research (ZBAF), Witten/Herdecke University, Witten, Germany.