Fang Zhang*, Wei Liu*, May C. Chu†, Jun He*, Qing Duan*, Xiao-Ming Wu*, Pan-He Zhang*, Qiu-Min Zhao*, Hong Yang*, Zhong-Tao Xin‡, and Wu-Chun Cao*
Author affiliations: *Beijing Institute of Microbiology and Epidemiology, Beijing, People's Republic of China; †World Health Organization, Geneva, Switzerland; ‡Beijing Institute of Basic Medical Sciences, Beijing, People's Republic of China
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