1. Department of Plastic and Reconstructive Surgery, Shanghai Ninth People’s Hospital, Shanghai Jiao Tong University School of Medicine, 639 Zhizaoju Road, Shanghai 200011, P. R. China
2. Shanghai Key Laboratory of Tissue Engineering, Shanghai Ninth People’s Hospital, National Tissue Engineering Center of China, Shanghai Jiao Tong University School of Medicine, Shanghai 200011, P. R. China