CJCP     2006 8 (4):  334-337    ISSN: 1008-8830  CN: 43-1301/R Association of breastfeeding with behavioral problems and temperament development in children aged 4-5 years LIU Fang, MA Li-Ji, YI Ming-Ji Department of Pediatrics, Zibo Central Hospital, Zibo, Shandong 255036, China. yimji@126.com Received: null  Revised: null  Online: null Supporting info