The infection attack rate and severity of 2009 pandemic H1N1 influenza in Hong Kong. - Wu, JT; Ma, ESK; Lee, CK; Chu, DKW; Ho, P-L; Shen, AL; Ho, A; Hung, IFN; Riley, S; Ho, L-M; Lin, CK; Tsang, T; et al. (Clin Infect Dis, 2010)