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Fibroblast Growth Factor (FGF) 23 levels across chronic obstructive pulmonary disease (COPD) exacerbation frequency sub-groups. Box and dot plot indicating FGF23 plasma level means in COPD patients sub-grouped by exacerbations with 0 = no exacerbations, 1 = one exacerbation and >2 exacerbations during the study period (statistical analysis using 1 way ANOVA with p = 0.02).
