Alexandros Andreou MD, PhD, Director, Dept. of Neurosurgery and Interventional Neuroradiology, Hygeia Hospital, Athens, Greece Prof. Gerhard Bavinzski, Dept. of Neurosurgery, University of Vienna, Austria Aikaterini Vlastou MD, Director, Dept. of Plastic Surgery, Hygeia Hospital Athens, Greece Prof. Ioannis Patsalas, Dept. of Neurosurgery, University of Thessaloniki, Greece Akis Frantzoglou MD, Director, Dept. of Neurosurgery, Nikaia Hospital, Athens, GreecePresident of Hellenic Neurosurgical Society Phillip Dodier MD, Dept. of Neurosurgery, University of Vienna, Austria Vladimir Papic MD, Ass. Professor, Dept. of Neurosurgery, University of Novi Sad, Serbia Panagiotis Papadopoulos-Manolarakis MD, MSc, PhD,Dept. of Neurosurgery, Nikaia Hospital, Greece Triantafyllos Triantafyllou MD, PhD, Dept. of Neurosurgery, Lamia Hospital, Greece, Sotiris Plakas MD, Dept. of Neurosurgery and Interventional Neuroradiology, Hygeia Hospital, Athens, Greece Christos Chrysikopoulos MD, Dept. of Neurosurgery and Interventional Neuroradiology, Hygeia Hospital, Athens, Greece Dimitris Charitos MD, Dept. of Neurosurgery and Interventional Neuroradiology, Hygeia Hospital, Athens, Greece Panagiotis Georgis MD, Dept. of Neurosurgery and Interventional Neuroradiology, Hygeia Hospital, Athens, Greece Loukas KalpouzosSenior Resident, University of Athens, Neurosurgical Department