1. Clinical Medical School, Guizhou Medical University, Guiyang, Guizhou 550025, P.R. China
2. School of Basic Medicine, Guizhou Medical University, Guiyang, Guizhou 550025, P.R. China
3. Department of Obstetrics and Gynecology, 925 Hospital of The Joint Logistics Support Force of The Chinese People's Liberation Army, Guiyang, Guizhou 550004, P.R. China
4. Department of Dermatology, Affiliated Hospital of Guizhou Medical University, Guiyang, Guizhou 550004, P.R. China