1. National Key Laboratory of Intelligent Tracking and Forecasting for Infectious Diseases (NITFID), Institute for Viral Disease Control and Prevention, China CDC, Beijing 102206, China
2. Capital Institute of Pediatrics, Beijing 100020, China
3. Shanxi Academy of Advanced Research and Innovation, Taiyuan 030032, China
4. Chongqing Research Institute of Big Data, Peking University, Chongqing 400039, China