CHINESE JOURNAL OF COAL INDUSTRY MEDICINE, Volume 12, Issue 8,2009, Pages 1315-1317,
CHINESE JOURNAL OF COAL INDUSTRY MEDICINE, Volume 12, Issue 8,2009, Pages 1249-1249,
CHINESE JOURNAL OF COAL INDUSTRY MEDICINE, Volume 12, Issue 8,2009, Pages 1188-1189,
CHINESE JOURNAL OF COAL INDUSTRY MEDICINE, Volume 12, Issue 8,2009, Pages 1200-1201,