[1] Westpfalz Klinikum, Dept Cardiothorac & Vasc Surg, Kaiserslautern, Germany
[2] Westpfalz Klinikum, Dept Pneumonol, Kaiserslautern, Germany
[3] Westpfalz Klinikum, Dept Cardiol, Kaiserslautern, Germany
[4] Univ Med Essen Ruhrlandklin, Dept Thorac Surg & Thorac Endoscopy, Essen, Germany
[5] Gen Univ Hosp Patras, Dept Cardiothorac Surg, Patras, Greece
[6] Gen Univ Hosp Patras, Dept Surg, Patras, Greece