1. Center for Endemic Disease Control; Chinese Center for Disease Control and Prevention; Harbin Medical University, Harbin 150081, Heilongjiang, China.
2. Center for Disease Control and Prevention in Xinjiang Uygur Autonomous Region, Urumqi 830002, Xinjiang, China.
3. Center for Disease Control and Prevention in Anhui Province, Hefei 238007, Anhui, China.
4. Institute for Endemic Disease Control and Prevention in Shanxi Province, Linfen 041000, Shanxi, China.
5. Center for Disease Control and Prevention in Liaoning Province, Shenyang 110005, Liaoning, China.
6. Center for Disease Control and Prevention in Sichuan Province, Chengdu 610041, Sichuan, China.
7. Center for Disease Control and Prevention in Fujian Province, Fuzhou 350001, Fujian, China.
8. Center for Disease Control and Prevention in Hubei Province, Wuhan 430079, Hubei, China.
9. Center for Endemic Disease Control; Chinese Center for Disease Control and Prevention; Harbin Medical University, Harbin 150081, Heilongjiang, China;Key lab of Etiology and Epidemiology, Education Bureau of Heilongjiang Province & Ministry of Health, Microelement and human health lab of Heilongjiang Province, Center for Endemic Disease Control, Chinese Center for Disease Control and Prevention, Harbin Medical University, Harbin 150081, Heilongjiang, China.