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CHINESE JOURNAL OF INDUSTRIAL HYGIENE AND OCCUPATIONAL DISEASES, Volume 25, Issue 6,2007, Pages 346-349, doi:10.3760/cma.j.issn.1001-9391.2007.06.007
CHINESE JOURNAL OF INDUSTRIAL HYGIENE AND OCCUPATIONAL DISEASES, Volume 25, Issue 6,2007, Pages 375-376, doi:10.3760/cma.j.issn.1001-9391.2007.06.018