Estimating the burden of 2009 pandemic influenza A (H1N1) in the United States (April 2009-April 2010). - Shrestha SS; Swerdlow DL; Borse RH; Prabhu VS; Finelli L; Atkins CY; Owusu-Edusei K; Bell B; Mead PS; Biggerstaff M; Brammer L; Davidson H; et al. (Clinical infectious diseases : an official publication of the Infectious Diseases Society of America, 2011)