1. Department of Anaesthesiology, Intensive Care, Emergency Care and Pain Medicine; Turku University Hospital; Turku; Finland
2. Department of Anaesthesiology; Orton Orthopaedic Hospital; Helsinki; Finland
3. Department of Orthopaedics; Turku University Hospital; Turku; Finland
4. Department of Clinical Pharmacology; University of Helsinki and HUSLAB, Helsinki University Central Hospital; Helsinki; Finland