CHINESE JOURNAL OF ENDEMIOLOGY, Volume 20, Issue 4,2001, Pages 290-290, doi:10.3760/cma.j.issn.1000-4955.2001.04.032
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CHINESE JOURNAL OF ENDEMIOLOGY, Volume 20, Issue 4,2001, Pages 252-254, doi:10.3760/cma.j.issn.1000-4955.2001.04.004
CHINESE JOURNAL OF ENDEMIOLOGY, Volume 20, Issue 4,2001, Pages 296-297, doi:10.3760/cma.j.issn.1000-4955.2001.04.020