1. Viral Immunobiology, Institute of Experimental Immunology, University of Zürich, Zürich, Switzerland;
2. Instituto de Ciências Biomédicas Abel Salazar and Graduate Program in Areas of Basic and Applied Biology (GABBA), University of Porto, Porto, Portugal; and
3. III Medizinische Klinik, University Medical Center of the Johannes Gutenberg University, Mainz, Germany