1. Department of Neurosurgery, General Aoyama Hospital
2. Department of Neurosurgery, Nagoya University Hospital
3. Department of Neurosurgery, Aichi Medical University Hospital
4. Department of Neurosurgery, Inazawa Manucipal Hospital
5. Division of Neurosurgery, St. Michael's Hospital, University of Toronto
6. Department of Orthopedic Surgery, Konan Kosei Hospital