1. Division of Intensive Care; Department of Anaesthesiology; Oulu University Hospital and Medical Research Center Oulu; Oulu University; Oulu Finland
2. Department of Radiology; Oulu University Hospital and Medical Research Center Oulu; Oulu University; Oulu Finland
3. Departments of Anaesthesiology and Surgery; Oulu University Hospital and Medical Research Center Oulu; Oulu University; Oulu Finland
4. Department of Infection Control; Oulu University Hospital and Medical Research Center Oulu; Oulu University; Oulu Finland