1. Department of Neurosurgery, Nanoori Hospital, Suwon, Republic of Korea
2. Department of Neurosurgery, Nanoori Hospital, Bupyeong-gu, Incheon, Republic of Korea
3. Department of Neurosurgery, Nanoori Hospital, Gangnam-gu, Seoul, Republic of Korea
4. Department of Orthopaedics and Traumatology, Grande Int. Hospital, Kathmandu, Bagmati, Nepal