1. WHO WPRO Regional Polio Reference Laboratory and National Health Commission Key Laboratory of biosafety, National Institute for Viral Disease Control and Prevention, Chinese Center for Disease Control and Prevention, Beijing, People’s Republic of China
2. Shandong Center for Disease Control and Prevention, Jinan, Shandong, People’s Republic of China
3. Yunnan Center for Disease Control and Prevention, Kunming, Yunnan, People’s Republic of China
4. Gansu Center for Disease Control and Prevention, Lanzhou, Gansu, People’s Republic of China
5. Hebei Center for Disease Control and Prevention, Shijiazhuang, Hebei, People’s Republic of China
6. Heilongjiang Center for Disease Control and Prevention, Harbin, Heilongjiang, People’s Republic of China
7. Center for Biosafety Mega-Science, Chinese Academy of Sciences, Wuhan, Hubei, People’s Republic of China