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Forest plot of the outcome of AF recrudescence and complications. (A) AF recurrence. (B) Pericardial effusion/cardiac tamponade. (C) PNP. AF, atrial fibrillation; PNP, phrenic nerve palsy; CB2, second-generation cryoballoon; CB3, third-generation cryoballoon; CB4, fourth-generation cryoballoon.
