1. Department of Medical Microbiology, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands
2. Department of Medical Microbiology, University Medical Center Utrecht, Utrecht, The Netherlands
3. Department of Ear, Nose and Throat Medicine, Rijnstate Hospital, Arnhem, The Netherlands
4. Department of Neurology, Rijnstate Hospital, Arnhem, The Netherlands
5. Department of Medical Microbiology and Immunology, Rijnstate Hospital, Arnhem, The Netherlands