1. The Center for Disease Control and Prevention in Fuling District, Chongqing, 408000 China
2. College
of Life Science and Engineering, Chongqing Three Gorges University, Wanzhou,
Chongqing, 404100 China
3. Township Central Hospital in Yihe Town, Fuling
District, Chongqing, 408104 China
4. Community Health Service Center in Lidu Town, Fuling
District, Chongqing, 408103 China