Davies, Justin E Instantaneous Wave-free Ratio versus Fractional Flow Reserve. [electronic resource] - The New England journal of medicine 10 2017 - 1597-1598 p. digital Publication Type: Letter; Comment ISSN: 1533-4406 Standard No.: 10.1056/NEJMc1711333 doi Subjects--Topical Terms: Coronary StenosisFractional Flow Reserve, MyocardialHumans