1 Department of Orthopaedics and Traumatology, Faculty of Medicine, Prince of Wales Hospital, The Chinese University of Hong Kong, Shatin, New Territories 999077, Hong Kong, China; The Joint Scoliosis Research Center of the Chinese University of Hong Kong and Nanjing University, Hong Kong 999077, China.
2 The Joint Scoliosis Research Center of the Chinese University of Hong Kong and Nanjing University, Hong Kong 999077, China; Department of Spine Surgery, the Affiliated Drum Tower Hospital of Nanjing University Medical School, Nanjing 210008, Jiangsu, China.