1. Department of Health Sciences and Technology, Samsung Advanced Institute for Health Sciences and Technology, Sungkyunkwan University, Seoul 06531, Republic of Korea
2. Department of Anatomy and Cell Biology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul 06531, Republic of Korea
3. Department of Neurosurgery, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul 06531, Republic of Korea
4. Department of Anatomy, Keimyung University School of Medicine, Daegu 42601, Republic of Korea