Ahmet Besir, Department of Anesthesiology and Critical Care, Karadeniz Technical University, Faculty of Medicine, Trabzon, Turkey
Ali Akdogan, Department of Anesthesiology and Intensive Care, Faculty of Medicine, Karadeniz Technical University, Trabzon, Turkey
Ali Riza Guvercin, Department of Neurosurgery. Faculty of Medicine, Karadeniz Technical University, Faculty of Medicine, Trabzon, Turkey