1. Department of Medical Microbiology, Centre of Infectious Diseases, Leiden University Medical Centre, P.O. Box 9600 RC, Leiden, Netherlands
2. Department of Neurology, Leiden University Medical Centre, P.O. Box 9600 RC, Leiden, Netherlands
3. Department of Medical Microbiology, OLVG Hospital, P.O. Box 95500, 1090 HM Amsterdam, Netherlands