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. 2017 Jun 14;4(2):e000431. doi: 10.1136/openhrt-2016-000431

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Assessment of classification mismatch between iFR and FFR. ACS, acute coronary syndrome; CAD, coronary artery disease; FFR, fractional flow reserve; iFR, instantaneous wave-free ratio. (Adapted from Echavarría-Pinto et al).⁴²