1. Department of Health Policy and Manage, School of Public Health, Peking University, Beijing, China
2. National Cancer Center/National Clinical Research Center for Cancer/Cancer Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, 17 Panjiayuan Nanli, Chaoyang District, Beijing, China
3. Nursing Department, Luoyang Orthopedic Hospital of Henan Province, Zhengzhou, China
4. Department of Neurosurgery, Joint Logistics Support Unit No. 904 Hospital, School of Medicine, Anhui Medical University, Wuxi, China