1. WHO WPRO Regional Polio Reference Laboratory and State Key Laboratory for Molecular Virology & Genetic Engineering, Institute for Viral Disease Control and Prevention, Chinese Center for Disease Control and Prevention, No. 27, Nanwei Road, Xuanwu District, Beijing 100050, People's Republic of China
2. Gansu Center for Disease Control and Prevention, Lanzhou 730000, People's Republic of China
3. Shandong Center for Disease Control and Prevention, No. 16992, Jingshi Road, Jinan 250014, People's Republic of China
4. Qinghai Center for Disease Control and Prevention, Xining 810007, People's Republic of China
5. Inner Mongolia Center for Disease Control and Prevention, Hohhot 010020, People's Republic of China