CHINESE JOURNAL OF COAL INDUSTRY MEDICINE, Volume 12, Issue 11,2009, Pages 1804-1805,
CHINESE JOURNAL OF COAL INDUSTRY MEDICINE, Volume 12, Issue 11,2009, Pages 1721-1722,
CHINESE JOURNAL OF COAL INDUSTRY MEDICINE, Volume 12, Issue 11,2009, Pages 1729-1729,
CHINESE JOURNAL OF COAL INDUSTRY MEDICINE, Volume 12, Issue 11,2009, Pages 1789-1790,