CHINESE JOURNAL OF COAL INDUSTRY MEDICINE, Volume 7, Issue 9,2004, Pages 843-844, doi:10.3969/j.issn.1007-9564.2004.09.036
CHINESE JOURNAL OF COAL INDUSTRY MEDICINE, Volume 7, Issue 9,2004, Pages 867-867, doi:10.3969/j.issn.1007-9564.2004.09.058
CHINESE JOURNAL OF COAL INDUSTRY MEDICINE, Volume 7, Issue 9,2004, Pages 869-869, doi:10.3969/j.issn.1007-9564.2004.09.060
CHINESE JOURNAL OF COAL INDUSTRY MEDICINE, Volume 7, Issue 9,2004, Pages 866-866, doi:10.3969/j.issn.1007-9564.2004.09.057
CHINESE JOURNAL OF COAL INDUSTRY MEDICINE, Volume 7, Issue 9,2004, Pages 863-863, doi:10.3969/j.issn.1007-9564.2004.09.054