[1] Natl Ctr Tumor Dis, Heidelberg, Germany
[2] Univ Heidelberg Hosp, Dept Gen Internal Med & Psychosomat, Heidelberg, Germany
[3] Univ Munich, Univ Hosp Grosshadem, Dept Internal Med 3, Munich, Germany
[4] Heidelberg Univ, Thorax Clin, Heidelberg, Germany
[5] Heidelberg Univ, Natl Ctr Tumor Dis, Heidelberg, Germany