CHINESE JOURNAL OF COAL INDUSTRY MEDICINE, Volume 12, Issue 4,2009, Pages 526-527,
CHINESE JOURNAL OF COAL INDUSTRY MEDICINE, Volume 12, Issue 4,2009, Pages 591-592,
CHINESE JOURNAL OF COAL INDUSTRY MEDICINE, Volume 12, Issue 4,2009, Pages 557-558,
CHINESE JOURNAL OF COAL INDUSTRY MEDICINE, Volume 12, Issue 4,2009, Pages 642-643,