1. Department of Neurosurgery, International St Mary's Hospital, Catholic Kwandong University, Incheon, Korea.
2. Department of Neurosurgery, Dong-A University Hospital, Dong-A University College of Medicine, Busan, Korea.
3. Department of Neurosurgery, Yonsei University Health System, Seoul, Korea.
4. Gamma Knife Center, Yonsei University Health System, Seoul, Korea.
5. Brain Tumor Center, Yonsei University Health System, Seoul, Korea.