Department of Infectious Diseases, West German Centre of Infectious Diseases, University Hospital Essen, University of Duisburg-Essen, D-45147 Essen, Germany
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Prof. Dr. Adalbert Krawczyk
Department of Infectious Diseases, West German Centre of Infectious Diseases, University Hospital Essen, University of Duisburg-Essen, D-45147 Essen, Germany