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CHINESE JOURNAL OF INDUSTRIAL HYGIENE AND OCCUPATIONAL DISEASES, Volume 27, Issue 6,2009, Pages 377, doi:10.3760/cma.j.issn.1001-9391.2009.06.025
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CHINESE JOURNAL OF INDUSTRIAL HYGIENE AND OCCUPATIONAL DISEASES, Volume 27, Issue 6,2009, Pages 345-347, doi:10.3760/cma.j.issn.1001-9391.2009.06.008