1. Department of Neurological Surgery, University of California, San Francisco, San Francisco, California; Division of Neurosurgery, Department of Surgery, National Taiwan University Hospital, Taipei, Taiwan; and Division of Neurosurgery, Department of Surgery, National Taiwan University Hospital, Yun-Lin Branch, Yun-Lin, Taiwan
2. Neuroradiology Section, Department of Radiology, University of California, San Francisco, San Francisco, California
3. Division of Neurosurgery, Department of Surgery, National Taiwan University Hospital, Taipei, Taiwan
4. Department of Neurological Surgery, University of California, San Francisco, San Francisco, California
5. Neruovascular Section, Department of Neurology, University of California, San Francisco, San Francisco, California