1. 1st Academic Neurosurgery Department, Aristotle University of Thessaloniki, AHEPA Hospital, Thessaloniki, Greece
2. Department of Pathology, School of Medicine, Aristotle University of Thessaloniki, Thessaloniki, Greece
3. 1st Academic ENT Department, Aristotle University of Thessaloniki, AHEPA Hospital, Thessaloniki, Greece
4. 2nd Academic Dermatological Department, Aristotle University of Thessaloniki, Papageorgiou General Hospital, Thessaloniki, Greece