CHINESE JOURNAL OF COAL INDUSTRY MEDICINE, Volume 9, Issue 11,2006, Pages 1133-1134, doi:10.3969/j.issn.1007-9564.2006.11.009
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CHINESE JOURNAL OF COAL INDUSTRY MEDICINE, Volume 9, Issue 11,2006, Pages 1147, doi:10.3969/j.issn.1007-9564.2006.11.023