1. Department of Endocrinology, The Third Xiangya Hospital, Central South University, Changsha, Hunan 410013, P.R. China
2. Department of Nephrology, The Second Xiangya Hospital, Central South University, Changsha, Hunan 410011, P.R. China
3. Department of Plastic and Reconstructive Surgery, The Third Xiangya Hospital, Central South University, Changsha, Hunan 410013, P.R. China
4. Department of Burns and Plastic Surgery, The Second Hospital of South China University, Hengyang, Hunan 421000, P.R. China
5. Department of Surgery, Surgical Bioengineering Laboratory, University of California Davis, Sacramento, CA 95817, USA
6. Department of Dermatology, Hunan People's Hospital, The First Affiliated Hospital of Hunan Normal University, Changsha, Hunan 410000, P.R. China