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CHINESE JOURNAL OF ENDEMIOLOGY, Volume 28, Issue 1,2009, Pages 61-65, doi:10.3760/cma.j.issn.1000-4955.2009.01.016
CHINESE JOURNAL OF ENDEMIOLOGY, Volume 28, Issue 1,2009, Pages 75-77, doi:10.3760/cma.j.issn.1000-4955.2009.01.019
CHINESE JOURNAL OF ENDEMIOLOGY, Volume 28, Issue 1,2009, Pages 97-100, doi:10.3760/cma.j.issn.1000-4955.2009.01.026