1 Division of Cardiology, Department of Internal Medicine, Teikyo University Hospital 2-11-1 Kaga, Itabashi-ku, Tokyo 173-8605, Japan. Electronic address: kataoaki@sd5.so-net.ne.jp.
2 Division of Cardiology, Department of Internal Medicine, Teikyo University Hospital 2-11-1 Kaga, Itabashi-ku, Tokyo 173-8605, Japan.