Initial clinical experience with the novel POLARx FIT cryoballoon system for pulmonary vein isolation in patients with atrial fibrillation by Hiroshi Fukunaga, Yukio Sekiguchi, Jun Sawaguchi, Yosuke Hayashi, Sou Asano, Kei Mabuchi, Kanki Inoue, Kohei Tanizaki, Jun Umemura, Mitsuaki Isobe, Junichi Nitta

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