1. Molecular Virology Laboratory, Department of Medical Microbiology, Leiden University Medical Center, Leiden, The Netherlands
2. Section Electron Microscopy, Department of Cell and Chemical Biology, Leiden University Medical Center, Leiden, The Netherlands
3. Virus Identification Laboratory, Victorian Infectious Diseases Reference Laboratory, Royal Melbourne Hospital, at the Peter Doherty Institute for Infection and Immunity, Victoria, 3000, Australia
4. Clinical Microbiology Laboratory, Department of Medical Microbiology, Leiden University Medical Center, Leiden, The Netherlands