CJCP     2008 10 (2):  143-145    ISSN: 1008-8830  CN: 43-1301/R Etiology of pneumonia in hospitalized patients less than 3 years of age CHEN Rong, HAO Chuang-Li, ZHAO Gen-Ming, ZHANG Tao, LIN Yu-Zun, DING Yun-Fang, TAO Yun-Zhen, ZHU Li-Juan Department of Epidemiology, School of Public Health, Fudan University, Shanghai 200032, China (Hao C-L, Email: hao-cl@yahoo.com.cn) Received: null  Revised: null  Online: null Supporting info