1 Center for Infectious Diseases, Institute of Medical Microbiology and Hygiene, Saarland University, Kirrberger Strasse, Building 43, 66421 Homburg/Saar, Germany.
2 Department of General, Visceral, Vascular and Pediatric Surgery, Saarland University, Kirrberger Strasse, Building 57, 66421 Homburg/Saar, Germany.
3 Center for Infectious Diseases, Institute of Medical Microbiology and Hygiene, Saarland University, Kirrberger Strasse, Building 43, 66421 Homburg/Saar, Germany. Electronic address: [email protected].