1 Division of Cardiovascular Medicine, Department of Medicine, Jichi Medical University School of Medicine, 3311-159 Yakushiji, Shimotsuke-shi, Tochigi, 329-0498, Japan.
2 Department of Medicine, Division of Endocrinology and Metabolism, Jichi Medical University Saitama Medical Center, 1-847 Amanuma-cho, Omiya-ku, Saitama, 330-8503, Japan.
3 Division of Cardiovascular Medicine, Department of Medicine, Jichi Medical University School of Medicine, 3311-159 Yakushiji, Shimotsuke-shi, Tochigi, 329-0498, Japan. kkario@jichi.ac.jp.