1. aDivision of Intensive Care Medicine, Department of Anaesthesiology, Tepecik Training and Research Hospital, Izmir, Turkey
2. bDivision of Intensive Care Medicine, Department of Pulmonology, Trakya University Faculty of Medicine, Edirne, Turkey
3. cDivision of Intensive Care Medicine, Department of Internal Medicine, Faculty of Medicine, Hacettepe University, Ankara, Turkey