1 Cardiovascular Medicine, Cardiovascular and Metabolic Research Center, Kansai University of Health Sciences, Osaka, 590-0482, Japan. tsudak@mail.wakayama-med.ac.jp.
2 Division of Cardiology, School of Medicine, Wakayama Medical University, Wakayama, 641-8509, Japan. tsudak@mail.wakayama-med.ac.jp.