[1] Univ Cologne, Inst Med Microbiol Immunol & Hyg, D-50931 Cologne, Germany
[2] Heidelberg Univ, Mannheim Univ Hosp, Dept Internal Med Haematol & Oncol 3, D-6800 Mannheim, Germany
[3] Univ Cologne, Dept Internal Med 1, D-50931 Cologne, Germany
[4] Univ Cologne, Clin Trials Ctr Cologne, ZKS Koln BMBF 01KN1106, D-50931 Cologne, Germany
[5] Univ Cologne, Dept Gen Visceral & Canc Surg, D-50931 Cologne, Germany
[6] Univ Hosp Cologne, Inst Pathol, Cologne, Germany
[7] Univ Hosp Cologne, Dept Radiol, Cologne, Germany