1. Zhejiang Provincial Center for Disease Control and Prevention, Zhejiang, People’s Republic of ChinaChinese Center for Disease Control and Prevention, Beijing, People’s Republic of China
2. Zhejiang Provincial Center for Disease Control and Prevention, Zhejiang, People’s Republic of China
3. Zhejiang Provincial Center for Disease Control and Prevention, Zhejiang, People’s Republic of ChinaChunan Center for Disease Control and Prevention, Chunan, Zhejiang, People’s Republic of China
4. Chinese Center for Disease Control and Prevention, Beijing, People’s Republic of China