1 Institute for Medical Microbiology, Immunology and Hygiene, University of Cologne, Goldenfelsstraße 19-21, 50935 Cologne, Germany. Electronic address: [email protected].
2 Center for Infectious Diseases and Travel Medicine, Department of Medicine, University Hospital of Freiburg, Hugstetter Straße 55, 79106 Freiburg, Germany.
3 Institute of Medical Statistics, Informatics and Epidemiology, University of Cologne, Kerpener Straße 62, 50924 Cologne, Germany.
4 Institute for Medical Microbiology, Immunology and Hygiene, University of Cologne, Goldenfelsstraße 19-21, 50935 Cologne, Germany.