CHINESE JOURNAL OF ENDEMIOLOGY, Volume 24, Issue 4,2005, Pages 428-430, doi:10.3760/cma.j.issn.1000-4955.2005.04.025
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CHINESE JOURNAL OF ENDEMIOLOGY, Volume 24, Issue 4,2005, Pages 378-381, doi:10.3760/cma.j.issn.1000-4955.2005.04.008