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Comparing peak-to-peak cardiogenic oscillations in RBC spectral parameters during the breath-hold for healthy versus IPF subjects. Oscillations in the RBC amplitude, chemical shift, and phase are significantly larger for IPF subjects than healthy volunteers (P = 0.008, P = 0.001, and P = 0.002). The black bar with the asterisk indicates statistical difference between groups (P < 0.05)
