1. Preventive Medicine Experimental Teaching Center, Zunyi Medical University, Zunyi, Guizhou, China
2. Department of Epidemiology, School of Medicine, Jinan University, Guangzhou, China
3. Department of Dermatology, Affiliated Hospital of Zunyi Medical University, Zunyi, Guizhou, China
4. Department of Nutrition, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan, China