1 Department of Cardiology, Institute of Medicine, University of Tsukuba, Tsukuba, Japan; Institute of Arrhythmia, Tokyo Heart Rhythm Hospital, Tokyo, Japan. Electronic address: [email protected].
2 Department of Cardiology, Institute of Medicine, University of Tsukuba, Tsukuba, Japan.
3 Department of Cardiology, Institute of Medicine, University of Tsukuba, Tsukuba, Japan; Institute of Arrhythmia, Tokyo Heart Rhythm Hospital, Tokyo, Japan.
4 Institute of Arrhythmia, Tokyo Heart Rhythm Hospital, Tokyo, Japan.