1. Department of Spinal Surgery, Peking University People’s Hospital, Peking University, Beijing, China
2. Institute of Geographical Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, China
3. Institute of Child and Adolescent Health, School of Public Health, Peking University, Beijing, China
4. Department of Paediatrics, Peking University People’s Hospital, Peking University, Beijing, China
5. Department of Pain Medicine Centre, Peking University Third Hospital, Peking University, Beijing, China