1. School of Public Health, the Key Laboratory of Environmental Pollution Monitoring and Disease Control, Ministry of Education, Guizhou Medical University
2. Tibet Center for Disease Control and Prevention
3. School of Public Health, Kunming Medical University
4. School of Medicine, Tibet University
5. Wuhou District Center for Disease Control and Prevention
6. Chongqing Center for Disease Control and Prevention
7. West China School of Public Health and West China Fourth Hospital, Sichuan University