CHINESE JOURNAL OF COAL INDUSTRY MEDICINE, Volume 5, Issue 4,2002, Pages 318-319, doi:10.3969/j.issn.1007-9564.2002.04.006
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CHINESE JOURNAL OF COAL INDUSTRY MEDICINE, Volume 5, Issue 4,2002, Pages 402-403, doi:10.3969/j.issn.1007-9564.2002.04.083