1. School of Health Sciences, University of Iceland, Reykjavik, Iceland
2. Department of Physiotherapy, Landspitali – The National University Hospital of Iceland, Reykjavik, Iceland
3. Department of Anaesthesiology and Intensive Care Medicine, Landspitali – The National University Hospital of Iceland, Reykjavik, Iceland
4. Department of Physical Therapy, Faculty of Medicine, The University of British Columbia, Vancouver, Canada