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But facts are fellows that will not be overturned,  \\And cannot be disputed)  \end{center}  The recent paper 'Wave separation, wave intensity, the reservoir-wave concept, and the instantaneous wave-free ratio' (2015) N Westerhof, P Segers and BE Westerhof, Hypertension, DOI: 10.1161/HYPERTENSIONAHA.115.05567 contains a number of factual errors that should be corrected.