1. State Key Laboratory of Infectious Disease Prevention and Control, National Institute for Communicable Disease Control and Prevention, Chinese Center for Disease Control and Prevention, Changping, Beijing, People’s Republic of China
2. Yunnan Institute of Endemic Diseases Control and Prevention, Dali, Yunnan, People’s Republic of China
3. Yunnan Provincial Center for Disease Control and Prevention, Kunming, Yunnan, People’s Republic of China
4. Institute of Infectious Disease Control and Prevention, Hangzhou Municipal Center for Disease Control and Prevention, Hangzhou, Zhejiang, People’s Republic of China
5. Shenzhen Nanshan Maternity and Child Healthcare Hospital, Shenzhen, Guangdong, People’s Republic of China