1. Department of Dermatology, The First Hospital of Harbin, Harbin, Heilongjiang 150010, P.R. China
2. Department of Dermatology, The Second Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang 150081, P.R. China
3. Department of Orthopaedic Surgery, The First Hospital of Harbin, Harbin, Heilongjiang 150010, P.R. China