CHINESE JOURNAL OF PREVENTIVE MEDICINE, Volume 44, Issue 10,2010, Pages 903-907, doi:10.3760/cma.j.issn.0253-9624.2010.10.013
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CHINESE JOURNAL OF PREVENTIVE MEDICINE, Volume 44, Issue 10,2010, Pages 954-955, doi:10.3760/cma.j.issn.0253-9624.2010.10.027