[1] Univ Munich, Klinikum Grosshadern, Inst Anasthesiol, D-81366 Munich, Germany
[2] Univ Munich, Klinikum Grosshadern, Chirurg Klin, D-81366 Munich, Germany
[3] Univ Munich, Klinikum Grosshadern, Frauenklin, D-81366 Munich, Germany
[4] Univ Munich, Max Von Pettenkofer Inst, D-81366 Munich, Germany