1. Department of Dermatology, The First Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang 150001, P.R. China
2. Department of Dermatology, Linyi People's Hospital, Linyi, Shandong 276000, P.R. China
3. Department of Dermatology, The Second Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang 150086, P.R. China