1. Biomechanics Labs of Orthopaedics Research Institute; Tianjin Hospital Heping Branch; 122 Munan Street, Heping District Tianjin 300050 China
2. Tianjin Medical University; No. 22 Qixiangtai Street, Heping District Tianjin 300052 China
3. First Teaching Hospital of Tianjin University of Traditional Chinese Medicine; No. 314, Anshan Road, Nankai District Tianjin 300193 China