Pathology Department, Institute of Dermatology and Hospital for Skin Diseases, Chinese Academy of Medical Sciences and Peking Union Medical College, Nanjing, China. Dermatology & STD, Peking University First Hospital, Peking, China. Dermatology Department, Peking Union Medical College Hospital, Peking, China. Dermatology Department, Peking University People's Hospital, Peking, China. Dermatology Department, Changhai Hospital, Shanghai, China. Dermatology Department, Shanghai Changzheng Hospital, Shanghai, China. Dermatology Department, Zhong Shan Hospital Fudan University, Shanghai, China. Dermatology Department, The University of Hong Kong-Shenzhen Hospital, Shenzhen, China. Dermatology Department, General Hospital of Southern Theater of the Command, Guangzhou, China. Department of Biostatistics, Nanjing Medical University, Nanjing, China.