Journal of Southern Medical University ›› 2006, Vol. 26 ›› Issue (07): 949-953.
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LI Zhi-feng, HU Yong, ZHAN Hui-chun, YUN Xue-xia, DU Yu-ping, KE Xue-mei, YU De-xian, LI Jian-dong, DAI Ying-chun, CHEN Qing, YU Shou-yi Department of Epidemiology, Southern Medical University, Guangzhou 510515, China