1. Department of Plastic and Reconstructive Surgery, Shanghai Key Laboratory of Tissue Engineering Research, Shanghai Ninth People's Hospital, National Tissue Engineering Center of China, Shanghai, P.R. China.
2. Department of Dermatology, Xinhua Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, P.R. China.
3. College of Textiles, Donghua University, Shanghai, P.R. China.