1. Yonsei University College of Medicine, Seoul, Korea.
2. Department of Neurosurgery, Brain Tumor Center, Severance Hospital, Yonsei University College of Medicine, Seoul, Korea.
3. Department of Neurosurgery, Dong-A University College of Medicine, Busan, Korea.
4. Department of Biostatistics, Graduate School of Public Health, Yonsei University, Seoul, Korea.
5. Department of Biochemistry and Molecular Biology, Institute of Genetic Science, Integrated Genomic Research Center for Metabolic Regulation, Yonsei University College of Medicine, Seoul, Korea.
6. Brain Korea 21 PLUS Project for Medical Science, Yonsei University College of Medicine, Seoul, Korea.
7. Department of Life Science, Research Institute for Natural Sciences, Hanyang University, Seoul, Korea.