1. Regional Cardiocerebrovascular Center, Department of Neurosurgery, Seoul National University Bundang Hospital, Seongnam, Korea
2. Department of Neurosurgery, Pohang SM Christianity Hospital, Pohang, Korea
3. Section of Neurosurgery, Department of Neuroscience, Makati Medical Center, Makati, Philippines
4. Department of Neurosurgery, Vicente Sotto Memorial Medical Center, Cebu, Philippines
5. Regional Cardiocerebrovascular Center, Department of Neurology, Seoul National University Bundang Hospital, Seongnam, Korea