Effect of Contact Vector Direction on Achieving Pulmonary Vein Isolation. (August 2019) - Hoshiyama, Tadashi; Fukushima, Hironobu; Noda, Katsuo; Oshima, Shuichi; Ashikaga, Keiichi; Ikeda, Tokunori; Sakamoto, Kenji; Tsujita, Kenichi