1. Division of Neurosurgery, Department of Surgery, Prince of Wales Hospital, Chinese University of Hong Kong, Hong Kong, China
2. Department of Neurosurgery, Eighth Affiliated Hospital of Guangxi Medical University, Guangxi, China
3. Department of Neurosurgery, Sichuan Province People's Hospital, Sichuan, China
4. Department of Neurosurgery, Pamela Youde Nethersole Eastern Hospital, Hong Kong, China
5. Department of Neurosurgery, Princess Margaret Hospital, Hong Kong, China
6. Department of Neurosurgery, Kwong Wah Hospital, Hong Kong, China