Gkaitatzi D, Anastasiadis P, Giakoustidis A 1st Department of Surgery, “Papageorgiou” General Hospital, School of Medicine, Aristotle University of Thessaloniki, Thessaloniki, Greece
Spartalis E, Tsaparas P, Antoniou E
Second Department of Propedeutic Surgery, University of Athens, Medical School, “Laiko” General Hospital, Athens, Greece