1. Department of Dermatology, The First Hospital of Zibo City, Zibo, Shandong 255200, P.R. China
2. Department of Dermatology, Taiyuan Center Hospital, Taiyuan, Shanxi 030009, P.R. China
3. Department of Respiratory Medicine, Jinzhong Hospital of Traditional Chinese Medicine, Jinzhong, Shanxi 030619, P.R. China
4. Department of Medical Cosmetology, Peace Hospital, Changzhi Medical College, Changzhi, Shanxi 046000, P.R. China
5. Department of Dermatology, The First Affiliated Hospital of Henan University, Zhengzhou, Henan 450052, P.R. China