Yutaka Otsuji1, Akira Kisanuki2, Shinichi Minagoe3, Chuwa Tei2. 1. Second Department of Internal Medicine, University of Occupational and Environmental Health, School of Medicine, 1-1 Iseigaoka, Yahatanishi-ku, Kitakyushu, 807-8555, Japan. otsujiy@med.uoeh-u.ac.jp. 2. Department of Cardiovascular Medicine, Kagoshima University, Kagoshima, Japan. 3. Department of Cardiology, National Hospital Organization Kagoshima Medical Center, Kagoshima, Japan.