S China J Prev Med ›› 2013, Vol. 39 ›› Issue (1): 56-58.doi: 10.13217/j.scjpm.2013.01.056
• Epidemiological Study and Investigation • Previous Articles Next Articles
WU Cheng-gang, ZHENG Hui-zhen, HAN Ke, GUO Xue, ZHENG Huan-ying, XU Ning, ZHANG Ji-kai