1. 1Laboratory of Virus Molecular Biology, Intercollegiate Faculty of Biotechnology, University of Gdańsk and Medical University of Gdańsk, Gdańsk, Poland
2. 2Department of Medical Microbiology, Leiden University Medical Center, Leiden, The Netherlands
3. 3Institute of Virology, University of Zurich, Zurich, Switzerland
4. 4Department of Medical Microbiology, University Medical Center Utrecht, Utrecht, The Netherlands