1. Department of Medical Microbiology, Albert Schweitzer Hospital, Dordrecht, the Netherlands
2. Laboratory of Medical Microbiology and Immunology, St Elisabeth Hospital, Tilburg, the Netherlands
3. National Institute of Public Health and the Environment, RIVM, Bilthoven, the Netherlands
4. Department of Virology, Erasmus Medical Centre, Rotterdam, the Netherlands
5. Amphia Academy, Amphia Hospital, Breda, the Netherlands
6. Department of Medical Microbiology, University of Groningen, University Medical Center Groningen, Groningen, the Netherlands