1. Department of Orthopedics, The First Affiliated Hospital of Xiamen University, Xiamen, PR China
2. Department of Neurosurgery, Daejeon Woori Spine Hospital, Daejeon, South Korea
3. Department of Orthopaedics & Traumatology, Caritas Medical Centre, Kowloon West Cluster Hospital Authority, Hong Kong, PR China
4. Department of Orthopaedics, Spine Unit, Queen Savang Vadhana Memorial Hospital, Sriracha, Chonburi, Thailand
5. Department of Neurosurgery, Seoul St. Mary's Hospital, The Catholic University of Korea, Seoul, South Korea