1. Department of Radiology, Ajou University School of Medicine, Ajou University Medical Center, Yeongtong-gu, Suwon, Korea
2. Department of Neurosurgery, Ajou University School of Medicine, Ajou University Medical Center, Yeongtong-gu, Suwon, Korea
3. Department of Humanities and Social Medicine, Office of Biostatistics, Ajou University School of Medicine, Yeongtong-gu, Suwon, Korea