1. Department of Anaesthesiology and Intensive Care; North Karelia Central Hospital; Joensuu; Finland
2. Intensive Care Unit; Jorvi Hospital, Helsinki University Central Hospital; Helsinki; Finland
3. Department of Anaesthesiology and Operative Services; Kuopio University Hospital; Kuopio; Finland
4. Centre for Prehospital Emergency Care; Kuopio University Hospital; Kuopio; Finland