[Influence factors of coal worker's pneumoconiosis combined with chronic obstructive pulmonary disease].
Lan
L
Ma
Xiao-ling
XL
Fu
D000368:Aged; D055008:Anthracosis / Q000150:complications*; D005163:Factor Analysis, Statistical; D006801:Humans; D008875:Middle Aged; D029424:Pulmonary Disease, Chronic Obstructive / Q000150:complications*