[1] Univ Munich, Dept Med 2, Klinikum Grosshadern, D-81377 Munich, Germany
[2] Univ Lubeck, Dept Radiol, Klinikum Schleswig Holstein, Lubeck, Germany
[3] Univ Munich, Klinikum Grosshadern, Dept Radiol, Munich, Germany
[4] Univ Munich, Klinikum Grosshadern, Dept Surg, Munich, Germany
[5] Univ Bonn, Dept Med 1, D-5300 Bonn, Germany
[6] Klinikum Dachau Amper Klin AG, Dachau, Germany
[7] Klinikum Traunstein, Traunstein, Germany
[8] Bavarian State Minist Environm, Munich, Germany