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 Prof. Rasulic Lukas,Dept. of Neurosurgery, Un. of Belgrade, Serbia Prof. Cenzato Marco,Dept. of Neurosurgery, Niguarda Hospital, Milan, Italy 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 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 Panagiotis Georgis MD, Dept. of Neurosurgery and Interventional Neuroradiology, Hygeia Hospital, Athens, Greece Dr. Georgios Skandalakis, MD, M.Sc, B.Sc, PhD.Clinical fellow, Department of neurosurgery, University of New Mexico Hospital