1. Department of Anaesthesiology, Division of Algology, GATA Haydarpasa Training Hospital, Istanbul, Turkey
2. Department of Anaesthesiology, Division of Algology, Maltepe University, Istanbul, Turkey
3. Department of Public Health, Faculty of Medicine, Marmara University, Istanbul, Turkey
4. Department of Anaesthesiology and Reanimation, Kartal Kosuyolu High Speciality Training and Research Hospital, Istanbul, Turkey