1. Department of Dermatology, Xiangya Hospital, Central South University, Changsha, Hunan 410008, P.R. China
2. Institute of Medical Sciences, Xiangya Hospital, Central South University, Changsha, Hunan 410008, P.R. China
3. Institute of Dermatology, Chinese Academy of Medical Sciences and Peking Union Medical College, Nanjing, Jiangsu 210042, P.R. China
4. Department of Dermatology, Affiliated Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei 430030, P.R. China
5. Department of Plastic Surgery of The Third Xiangya Hospital, Central South University, Changsha, Hunan 410013, P.R. China
6. Department of Dermatology, University of Pennsylvania School of Medicine, Philadelphia, PA 19104, USA