1. WHO WPRO Regional Polio Reference Laboratory, NHC Key Laboratory of Biosafety and NHC Key Laboratory of Medical Virology, National Institute for Viral Disease Control and Prevention, Chinese Center for Disease Control and Prevention, Beijing, People’s Republic of China
2. Sichuan Center for Disease Control and Prevention, Chengdu, People’s Republic of China
3. Xinjiang Uygur Autonomous Region Center for Disease Control and Prevention, Urumqi, People’s Republic of China
4. Center for Biosafety Mega-Science, Chinese Academy of Sciences, Wuhan, People’s Republic of China