1 Department of Anesthesiology, University Hospital Regensburg, Regensburg 93053, Germany; Department of Radiology, University Hospital Regensburg, Regensburg 93053, Germany. Electronic address: benedikt.trabold@ukr.de.
2 Department of Anesthesiology, University Hospital Regensburg, Regensburg 93053, Germany; Department of Radiology, University Hospital Regensburg, Regensburg 93053, Germany.