CHINESE JOURNAL OF PREVENTIVE MEDICINE, Volume 37, Issue 6,2003, Pages 464, doi:10.3760/j:issn:0253-9624.2003.06.026
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CHINESE JOURNAL OF PREVENTIVE MEDICINE, Volume 37, Issue 6,2003, Pages 459-462, doi:10.3760/j:issn:0253-9624.2003.06.019