Affiliation: | 1. Department of Clinical Microbiology, Statens Seruminstitut, DK 2300, K?benhavn S, Denmark 3. Department of Medical Microbiology, University Hospital of Wales, CF4 4XW, Cardiff, UK 4. Department of Medical Microbiology, Lund University, Malm? University Hospital, S-20502, Malm?, Sverige
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