1 4th Surgical Department of Aristotle University in Thessaloniki, "G Papanikolaou" General Hospital in Thessaloniki, Exochi, Thessaloniki, Greece.
2 Department of Anesthesiology, "G Papanikolaou" General Hospital in Thessaloniki, Exochi, Thessaloniki, Greece. Electronic address: annagkio@gmail.com.
3 Department of Anesthesiology, "G Papanikolaou" General Hospital in Thessaloniki, Exochi, Thessaloniki, Greece.