CHINESE JOURNAL OF COAL INDUSTRY MEDICINE, Volume 12, Issue 12,2009, Pages 1861-1862,
CHINESE JOURNAL OF COAL INDUSTRY MEDICINE, Volume 12, Issue 12,2009, Pages 1881,
CHINESE JOURNAL OF COAL INDUSTRY MEDICINE, Volume 12, Issue 12,2009, Pages 1891-1892,
CHINESE JOURNAL OF COAL INDUSTRY MEDICINE, Volume 12, Issue 12,2009, Pages 1965-1967,