1Northern Anesthesia and Pain Medicine, LLC, Eagle River, AK USA
2Department of Anesthesiology and Pain Medicine, University of Washington School of Medicine, Seattle, WA USA
3Department of Psychiatry, Psychotherapy and Psychosomatic Medicine, Evangelisches Krankenhaus Castrop-Rauxel, Academic Teaching Hospital of the University of Duisburg-Essen, Castrop-Rauxel, Germany
4Department of Psychiatry and Psychotherapy, Faculty of Medicine, LVR-Hospital Essen, University of Duisburg-Essen, Essen, Germany
5Department of Anesthesiology, Louisiana State University Health Sciences Center, Shreveport, LA USA
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