CHINESE JOURNAL OF COAL INDUSTRY MEDICINE, Volume 9, Issue 3,2006, Pages 228-229, doi:10.3969/j.issn.1007-9564.2006.03.020
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CHINESE JOURNAL OF COAL INDUSTRY MEDICINE, Volume 9, Issue 3,2006, Pages 265-266, doi:10.3969/j.issn.1007-9564.2006.03.055