1. Department of Occupational and Environmental Health Xiangya School of Public Health, Central South University Changsha China
2. Experimental Center for Preventive Medicine Xiangya School of Public Health, Central South University Changsha China
3. Department of Nutrition and Food Hygiene Xiangya School of Public Health, Central South University Changsha China
4. Central Laboratory Occupational Disease Prevention and Control Hospital of Hunan Province Changsha China