1. Department of Orthopaedics, Tianjin Medical University General Hospital, Tianjin, P. R. China
2. Key Laboratory of Immuno Microenvironment and Disease of the Educational Ministry of China, Department of Immunology, Tianjin Medical University, Tianjin, P. R. China
3. Department of Immunology, Tianjin Medical University, Tianjin, P. R. China
4. 221 Laboratory, School of Medicine, Nankai University, Tianjin, P. R. China