1. Department of Anesthesiology and Intensive Care Medicine Institute of Clinical Sciences The Sahlgrenska Academy University of Gothenburg Gothenburg Sweden
2. Division of Pain Management Department of Anesthesiology and Intensive Care Medicine NU‐Hospitals Trollhättan Sweden
3. Department of Clinical Neuroscience and Rehabilitation Institute of Neuroscience and Physiology The Sahlgrenska Academy University of Gothenburg SE 413 45 Gothenburg Sweden