1 Department of Anesthesiology, Surgical Intensive Care, Emergency and Pain Medicine, Ruhr-University Bochum, Klinikum Herford, Herford, Germany.
2 Department of Diagnostic and Interventional Radiology and Neuroradiology, Klinikum Herford AöR, Herford, Germany.
3 Department of Anesthesiology, Surgical Intensive Care, Emergency and Pain Medicine, Ruhr-University Bochum, Klinikum Herford, Herford, Germany. Thomas.Koehler@ruhr-uni-bochum.de.
4 Department of Anesthesiology and Intensive Care Medicine, AMEOS Hospital Halberstadt, Academic Teaching Hospital of the Otto von Guericke University Magdeburg, Halberstadt, Germany. Thomas.Koehler@ruhr-uni-bochum.de.