1. Department of Surgery, Center for Surgical Science Zealand University Hospital Koege Denmark
2. Department of Anaesthesiology and Intensive Care Aarhus University Hospital Aarhus Denmark
3. Department of Public Health, Section of Nursing Science Aarhus University Aarhus Denmark
4. Department of Anaesthesiology Herlev Hospital, University of Copenhagen Copenhagen Denmark
5. Department of Clinical Medicine, Faculty of Health Sciences University of Copenhagen Copenhagen Denmark