1. Institute of Orthopedics; Chinese PLA General Hospital; Beijing Key Lab of Regenerative Medicine in Orthopedics; Key Lab of Musculoskeletal Trauma & War Injuries, PLA; No. 28 Fuxing Road Beijing 100853 P. R. China
2. School of Medicine; Nankai University; No. 94 Weijin Road Tianjin 300071 P. R. China
3. Co-innovation Center of Neuroregeneration; Nantong University; Nantong Jiangsu Province 226007 P. R. China
4. Department of Surgery; Ludwig-Maximilians-University (LMU); Nussbaumstr. 20 Munich 80336 Germany
5. Department of Otolaryngology; First Teaching Hospital of Tianjin University of Traditional Chinese Medicine; No. 314 An Shan Xi Road Tianjin 300192 P. R. China