Association of serotype with risk of death due to pneumococcal pneumonia: a meta-analysis. - Weinberger, D; Harboe, Z; Sanders, E; Ndiritu, M; Klugman, K; Rückinger, S; Dagan, R; Adegbola, R; Cutts, F; Johnson, H; O'Brien, K; Scott, J; et al. (Clinical infectious diseases : an official publication of the Infectious Diseases Society of America, 2010)