1 Department of Dermatology, Hangzhou Third People's Hospital, Zhejiang University School of Medicine, No.38, West Lake Rd, Shangcheng District, Hangzhou, 310009, Zhejiang Province, China.
2 Department of Dermatology, Hangzhou Third People's Hospital, Zhejiang University School of Medicine, No.38, West Lake Rd, Shangcheng District, Hangzhou, 310009, Zhejiang Province, China. zehuliu@yahoo.com.