Department of Preventive Medicine;
Public Health School;
Shanghai Second Medical University;
No. 280;
Chongqing South Road;
Shanghai 200025;
China;
Institute of Environmental Medicine;
Tongji Medical College;
Huazhong University of Science and Technology;
Wuhan 430030;
Hubei;
China;
Center for Disease Control & Prevention;
Huangpu District;
Shanghai 200002;
China;