CHINESE JOURNAL OF COAL INDUSTRY MEDICINE, Volume 3, Issue 11,2000, Pages 1115-1116, doi:10.3969/j.issn.1007-9564.2000.11.031
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CHINESE JOURNAL OF COAL INDUSTRY MEDICINE, Volume 3, Issue 11,2000, Pages 1090-1091, doi:10.3969/j.issn.1007-9564.2000.11.007