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Correlation (r = 0.91) with a regression slope of 0.94 (95% CI 0.81 to 1.07; P<0.0001) between two diameters of the inflated sizing balloon, measured in two orthogonal projections, confirming the round shape of the patent foramen ovale (PFO) once the balloon is expanded. LAO Left anterior oblique; PA Posteroanterior
