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APA Citation
To, K. K. W., Wong, S. S. Y., Li, I. W. S., Hung, I. F. N., Tse, H., Woo, P. C. Y., Chan, K., & Yuen, K. (2010). concurrent comparison of epidemiology, clinical presentation and outcome between adult patients suffering from the pandemic influenza A (H1N1) 2009 virus and the seasonal influenza A virus infection. Postgraduate medical journal, 86(1019), 515–521. http://access.bl.uk/ark:/81055/vdc_100135541045.0x000039