[1] Univ Duisburg Essen, Univ Hosp, W German Lung Ctr, Div Thorac Surg,Ruhrlandklin, Essen, Germany
[2] Univ Duisburg Essen, Univ Hosp, W German Lung Ctr, Dept Pneumol,Ruhrlandklin, Essen, Germany
[3] Univ Duisburg Essen, Univ Hosp, W German Lung Ctr, Dept Med Oncol, Essen, Germany