CJCP     2009 11 (12):  1017-1018    ISSN: 1008-8830  CN: 43-1301/R Food frequency in 327 children aged 2 to 4 years in Huining Gansu WANG Ning, WANG Rui, MA En-He, ZHANG Ge-Xiang, WANG Yu Lanzhou Center for Disease Control and Prevention, Lanzhou, Gusu 730000, China Received: null  Revised: null  Online: null Supporting info