Figure 3From: Disturbance of the OPG/RANK/RANKL pathway and systemic inflammation in COPD patients with emphysema and osteoporosisComparison of serum OPG/RANK/RANKL levels among three groups. *p < 0.05. Abbreviations: OPG: osteoprotegerin, RANK: receptor activator of NF-κB, RANKL: RANK ligand.Back to article page