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Lee, Kenneth KC; Li, Shu Chuen; Kwong, Kai Sun; Chan, Thomas YK; Lee, Vivian WY; Lau, Joseph TF . (2008). A study of the health and economic effects of influenza-like illness on the working population under different working environments of a large corporation in Hong Kong. Journal of Medical Economics, 11(4), 639–650. doi:10.3111/13696990802533179 
10.3111/13696990802533179