CHINESE JOURNAL OF COAL INDUSTRY MEDICINE, Volume 12, Issue 9,2009, Pages 1374-1374,
CHINESE JOURNAL OF COAL INDUSTRY MEDICINE, Volume 12, Issue 9,2009, Pages 1390-1391,
CHINESE JOURNAL OF COAL INDUSTRY MEDICINE, Volume 12, Issue 9,2009, Pages 1364-1365,
CHINESE JOURNAL OF COAL INDUSTRY MEDICINE, Volume 12, Issue 9,2009, Pages 1416-1416,