Review of an influenza surveillance system, Beijing, People's Republic of China.
Yang P, Duan W, Lv M, Shi W, Peng X, Wang X, Lu Y, Liang H, Seale H, Pang X, Wang Q.
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Emerg Infect Dis. 2009 Oct;15(10):1603-8. doi: 10.3201/eid1510.081040.
Emerg Infect Dis. 2009.
PMID: 19861053
Free PMC article.