1. Department of Anesthesiology, Heidelberg University, Im Neuenheimer Feld 110, 69120 Heidelberg, Germany
2. Department of Surgery, Heidelberg University, Im Neuenheimer Feld 110, 69120 Heidelberg, Germany
3. Department of Diagnostic Radiology, Heidelberg University, Im Neuenheimer Feld 110, 69120 Heidelberg, Germany