Serogroup-specific epidemiology of Streptococcus pneumoniae: associations with age, sex, and geography in 7,000 episodes of invasive disease. de réir Scott, J, Hall, A, Dagan, R, Dixon, J, Eykyn, S, Fenoll, A, Hortal, M, Jetté, L, Jorgensen, J, Lamothe, F, Latorre, C, Macfarlane, J, Shlaes, D, Smart, L, Taunay, A