1. Department of Neurosurgery, Tohoku University Graduate School of Medicine, Sendai;
2. Neuroendovascular Section, Department of Neurology, Faculty of Medicine, Tanta University, Tanta, Egypt
3. Departments of Neurosurgery and
4. Neuroendovascular Therapy, Kohnan Hospital, Sendai;
5. Department of Neurosurgery, Kitasato University School of Medicine, Sagamihara, Japan; and