1 Department of Infectious Diseases, West German Centre of Infectious Diseases, University Hospital Essen, University of Duisburg-Essen, Essen, Germany.
2 Department of Nephrology, University Hospital Essen, University of Duisburg-Essen, Essen, Germany.
3 KfH Kuratorium für Dialyse und Nierentransplantation e.V., Kronach, Germany.
4 Institute for Virology, University Hospital Essen, University of Duisburg-Essen, Essen, Germany.
5 Department of Nephrology, University Hospital Essen, University of Duisburg-Essen, Essen, Germany. Electronic address: benjamin.wilde@uk-essen.de.