Affiliation: | Institute for Medical Microbiology and Virology, Heinrich-Heine Universit?t Düsseldorf, Universit?tsstra?e 1, Geb. 22.21, 40225 Dusseldorf, Germany e-mail: schmitfj@uni-duesseldorf.de Tel./Fax: +49-2132-72040, DE Eijkman-Winkler Institute for Medical Microbiology, University Medical Center Utrecht, Utrecht, The Netherlands, NL
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