H Wang1,2, X Wang1,2, B Yang1,2, H Liu1,2, F Zhang1,2. 1. Shandong Provincial Hospital for Skin Diseases, Shandong First Medical University, 27397 Jingshi Road, Shandong 250022, China. 2. Shandong Provincial Institute of Dermatology and Venereology, Shandong Academy of Medical Sciences, 27397 Jingshi Road, Shandong 250022, China.