1. Department of Neurosurgery, Nanoori Hospital (Suwon), Suwon, Korea (the Republic of)
2. Department of Neurosurgery, Hasan Sadikin Hospital, College of Medicine, Padjadjaran University Bandung, Jawa Barat, Indonesia
3. Department of Neurosurgery, Nanoori Hospital Seoul, Gangnam-gu, Seoul, Korea (the Republic of)
4. Department of Neurosurgery, Nanoori Hospital Incheon, Incheon, Korea (the Republic of)