1. Key Laboratory of Etiology and Epidemiology, National Health Commission & Education Bureau of Heilongjiang Province (23618504), Harbin Medical University, Harbin, Heilongjiang Province, China
2. Heilongjiang Provincial Key Laboratory of Trace Elements and Human Health, Harbin Medical University, Harbin, Heilongjiang Province, China
3. Center for Endemic Disease Control, Chinese Center for Disease Control and Prevention, Harbin Medical University, Harbin, Heilongjiang Province, China
4. Department of Pathology and Key Lab of Endemic and Ethnic Diseases, Ministry of Education, Guizhou Medical University, Guiyang, Guizhou Province, China