CHINESE JOURNAL OF COAL INDUSTRY MEDICINE, Volume 12, Issue 5,2009, Pages 689-691,
CHINESE JOURNAL OF COAL INDUSTRY MEDICINE, Volume 12, Issue 5,2009, Pages 782,
CHINESE JOURNAL OF COAL INDUSTRY MEDICINE, Volume 12, Issue 5,2009, Pages 752,
CHINESE JOURNAL OF COAL INDUSTRY MEDICINE, Volume 12, Issue 5,2009, Pages 729,