Analysis on iodized salt surveillance by randomly sampling in China in 2009
XU Jing;WANG Jian-qiang;DONG Hui-jie;LI Su-mei;WANG Hai-yan;LI Xiu-wei;GU Yun-you Department of Iodine Deficiency Disorders;Institute for Communicable Disease Control and Prevention;Chinese Center for DiseaseControl and Prevention;Beijing 102206;China