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Proportions of different ostium shapes of the four targeted PVs. Dlong: PV ostium long diameter; Dshort: PV ostium short diameter; Dcorrected: Corrected diameter calculated from PV ostium perimeter PV ostium; CB: cryoballoon; LSPV: left superior pulmonary vein; LIPV: left inferior pulmonary vein; RIPV: right inferior pulmonary vein; RSPV: right superior pulmonary vein.
