1. Department of Dermatology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, P. R. China
2. Department of Dermatology, Henan Provincial People's Hospital, Zhengzhou 450003, P. R. China
3. ,, Henan Province Medical Instrument Testing Institute, Zhengzhou 450018, P.R. China
4. School of Life Sciences, Zhengzhou University, Zhengzhou 450001, P.R. China
5. Department of Anatomy, College of Basic Medical Sciences, Zhengzhou University, Zhengzhou 450000, P.R. China