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Takayanagi N, Hara K, Tokunaga D, Takaku Y, Minagawa S, Tsuchiya Y, Hijikata N, Yamaji T, Saito H, Ubukata M, Kurashima K, Yanagisawa T, Sugita Y. [Etiology and outcome of community-acquired pneumonia in relation to age and severity in hospitalized adult patients]. J Jpn Respir Society. 2006; 44(12): 906-15.