5Rudan I, Tmaskovic L, Bochi-Pinto C,et al. Global estimate of the in- cidence of clinical pneumonia amo:xg children under five yeax's of age [J]. Bull World Heal Organ, 2004,82(12) :895 -903.
6Bryce J, Bochi-Pinto C,Shibuya K, et al. WHO estimates of the cau- ses of death in children [ J ]. Lancet,2005,365 ( 9465 ) : 1147 - 1152.