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A: Schematic of blood samples obtained from patients tested for PICP, CITP, and PIIINP; B Average values for serum PICP levels in control patients, patients developing AF, and patients remaining in NSR after surgery; C: Histogram of serum PICP values in control and surgical patients; D: PICP ROC curve Abbreviations: AF-Atrial Fibrillation, PICP- Carboxyl terminal peptide from Pro-Collagen I, NSR-Normal Sinus Rhythm. *Denotes statistical significance
