1. School of Public Health, Kunming Medical University, Kunming 650500, China
2. Centers for Disease Control and Prevention of Yunnan Province, Kunming 650118, China
3. The Affiliated Hospital of Stomatology, Chongqing Medical University, Chongqing 401147, China
4. Kunming Centers for Disease Control and Prevention, Kunming 650228, China
5. Library, Kunming Medical University, Kunming 650500, China
6. Statistics, Modelling and Economics Department, Data, Analytics & Surveillance, UK Health Security Agency, London NW9 5EQ, UK