Bin Lu1, Huan Guo2, Hongguang Lu3. 1. Dermatology Department, Affiliated Hospital of Guiyang Medical College, Guiyang, Guizhou, China; Dermatology Department, Affiliated Hospital of Jining Medical College, Jining, Shandong, China; Dermatology Department, the First Hospital of China Medical University, Shenyang, Liaoning, China. 2. Medical Laboratories, Affiliated Hospital of Jining Medical College, Jining, Shandong, China. 3. Medical Laboratories, Affiliated Hospital of Jining Medical College, Jining, Shandong, China; Dermatology Department, the First Hospital of China Medical University, Shenyang, Liaoning, China. Electronic address: hongguanglu@hotmail.com.