S China J Prev Med ›› 2016, Vol. 42 ›› Issue (6): 510-515.doi: 10.13217/j.scjpm.2016.0510
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GONG Si-hong1,XIA Liang2, XU Hao-feng2,LI De-yun1,ZHOU Shao-en2, XIAO Ni2,LIANG Xiao-dong1, SONG Xiu-ling2, MENG Rui-lin2