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Scatterplot showing: A) Ent−7-epi−7-F2t-dihomo-IsoP, B) Ent−7-(R)−7-F2t-dihomo-IsoP, and C) the total sum of F2-dihomo-IsoPs (ng mg−1 creatinine in urine) versus age (years) in our volunteers. The Spearman rank correlation coefficient (Rho) and P-value are shown.