1. Department of Anaesthesia and Intensive Care Medicine Ystad Hospital Ystad Sweden
2. Department of Clinical Sciences Lund University Lund Sweden
3. Clinical Epidemiology Unit Orthopaedics Lund University Lund Sweden
4. Department of Emergency and Internal Medicine Skåne University Hospital Malmö Sweden
5. Department of Anaesthesia and Intensive Care Helsingborg Hospital Helsingborg Sweden