1. Department of Cardiology, Kawasaki Municipal Hospital, 12-1 Shinkawa St, Kawasaki-ku, Kawasaki City, Kanagawa 210-0013, Japan
2. Department of Internal Medicine, Kawasaki Municipal Hospital, 12-1 Shinkawa St, Kawasaki-ku, Kawasaki City, Kanagawa 210-0013, Japan