1. Division of Advanced Arrhythmia Management (T.S., A.U.), the Second Department of Internal Medicine, Kyorin University School of Medicine, Mitaka, Japan.
2. Division of Cardiology (K.S., A.M., T.M., M.T., Y.M., M.K., N.N., K.H., Y.M., I.T.), the Second Department of Internal Medicine, Kyorin University School of Medicine, Mitaka, Japan.