1. Department of Plastic and Reconstructive Surgery Shanghai Ninth People's Hospital Shanghai Jiao Tong University School of Medicine 639 Zhi Zao Ju Road Shanghai 200011 P. R. China
2. Department of Plastic and Burn Surgery The First Affiliated Hospital of Chongqing Medical University No.1 Youyi Road Chongqing 400042 P. R. China
3. Department of Orthopaedics Shanghai Key Laboratory for Prevention and Treatment of Bone and Joint Diseases Shanghai Institute of Traumatology and Orthopaedics Ruijin Hospital Shanghai Jiao Tong University School of Medicine 197 Ruijin 2nd Road Shanghai 200025 P. R. China