CJCP     2011 13 (12):  959-961    ISSN: 1008-8830  CN: 43-1301/R Risk factors for infection with extended-spectrum beta-lactamase-producing strains in children LIU Jian-Hua, LIU Xin-Feng, SHUAI Jin-Feng, WU Fang, HU Hao-Fu Children's Hospital of Hebei Province, Shijiazhuang 050031, China. liujianhua@sina.com Received: null  Revised: null  Online: null Supporting info