[1] Univ Klinikum Koln AoR, Klin & Poliklin Herzchirurg Herzchirurg Intens Me, Kerpener Str 62, D-50937 Cologne, Germany
[2] Univ Med Mannheim, Sekt Pneumol, Med Klin 1, Mannheim, Germany
[3] Ohio State Univ, James Comprehens Canc Ctr, Columbus, OH 43210 USA
[4] Univ Cologne, Inst Pathol, Univ Klinikum Koln AoR, Mol,Pathol, Cologne, Germany
[5] Univ Klinikum Koln AoR, Klin & Poliklin Allgemein Viszeral & Tumorchirug, Cologne, Germany