Cardiovascular Division, Department of Internal Medicine, Hyogo College of Medicine, 1-1, Mukogawa-cho, Nishinomiya, Hyogo, 663-8501, Japan. Department of Pharmacy, School of Pharmacy, Hyogo University of Health Sciences, Kobe, Japan. Department of Cardiovascular Medicine, Akita University Graduate School of Medicine, Akita, Japan. Division of Molecular Medicine and Therapeutics, Department of Multidisciplinary Internal Medicine, Faculty of Medicine, Tottori University, Yonago, Japan. Department of Cardiovascular Medicine, Wakayama Medical University, Wakayama, Japan. Division of Central Clinical Laboratory, Kinki University School of Medicine, Osakasayama, Japan. Department of Cardio-Renal Medicine and Hypertension, Nagoya City University Graduate School of Medical Sciences, Nagoya, Japan. Division of Biostatistics, Department of Mathematics, Hyogo College of Medicine, Nishinomiya, Japan. Department of Health Sciences, Osaka University Graduate School of Medicine, Suita, Japan. Cardiovascular Division, Department of Internal Medicine, Hyogo College of Medicine, 1-1, Mukogawa-cho, Nishinomiya, Hyogo, 663-8501, Japan. masuyama@hyo-med.ac.jp.