[1] Natl Hosp Org, Yokohama Med Ctr, Yokohama, Kanagawa, Japan
[2] Tokyo Womens Med Univ, Dept Cardiol, Clin Res Div Heart Rhythm Management, 8-1 Kawadacho,Shinjuku Ku, Tokyo 1628666, Japan
[3] Thomas Jefferson Univ Hosp, Dept Med, Div Cardiol, Philadelphia, PA USA
[4] Univ Calif San Francisco, Div Cardiol, Sect Cardiac Electrophysiol, San Francisco, CA USA