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据《The Lancet》1997年349卷第9068期报道 肺炎是全世界5岁以下儿童发病和死亡的最重要原因。发展中国家进行的研究已证实
According to The Lancet, Volume 349, Issue 9068, 1997, pneumonia is the most important cause of morbidity and mortality in children under five years of age worldwide. Studies conducted in developing countries have confirmed