Fig. 6From: The utility of long non-coding RNAs in chronic obstructive pulmonary disease: a comprehensive analysisFunnel plot of publication bias for diagnostic accuracy of COPD. (A) COPD vs. NCs, (B) AECOPD vs. COPD. AECOPD, acute exacerbations of Chronic obstructive pulmonary disease. COPD, Chronic obstructive pulmonary disease. NC, normal controlBack to article page