1 Ataturk Sanatorium Training and Research Hospital, Department of Anesthesiology and Reanimation, Ankara, Turkey. Electronic address: mnroksuz@hotmail.com.
2 Ataturk Sanatorium Training and Research Hospital, Department of Anesthesiology and Reanimation, Ankara, Turkey.
3 Public Health Specialist, Ankara, Turkey.
4 Ataturk Sanatorium Training and Research Hospital, Department of General Surgery, Ankara, Turkey.
5 Koru Hospital, Department of General Surgery, Ankara, Turkey.