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Forest plots of the association between the VDBP polymorphism and risk of COPD in GC1F/2 group (co-dominant model). (A) 1F-1F vs. 2-2; (B) 1F-2 vs. 2-2; (C) 1F-1F vs. 1F-2. VDBP, vitamin D binding protein; COPD, chronic obstructive pulmonary disease.
