Department of Neurosurgery Institute of Wonkwang Medical Science Wonkwang University School of Medicine Iksan South Korea;
Department of Neurosurgery Hallym University Sacred Heart Hospital Chuncheon South Korea;
Department of Neurosurgery Korea University Guro Hospital Seoul South Korea;
Department of Neurosurgery Armed Forces Capital Hospital Seongnam South Korea;
Department of Neurosurgery Armed Forces Capital Hospital Seongnam South Korea;
Department of Neurosurgery Armed Force Hospital Yangju South Korea;
Department of Neurosurgery Korea University Anam Hospital Seoul South Korea;
Department of Neurosurgery Korea University Ansan Hospital Ansan South Korea;
Department of Neurosurgery Yeouido St.Mary's Hospital Catholic University Seoul South Korea;
Department of Neurosurgery Catholic University St.Mary's Hospital Bucheon South Korea;
Department of Neurosurgery Wonju Severance Christian Hospital Wonju South Korea;
