1 Department of Cardiovascular Medicine, Sapporo Cardiovascular Clinic, Sapporo Heart Center, Sapporo, Japan; Division of Cardiology, Department of Internal Medicine, Taipei Veterans General Hospital, Taipei, Taiwan; Department of Internal Medicine, School of Medicine, College of Medicine, National Yang Ming Chiao Tung University, Taipei, Taiwan; Department of Biomedical Engineering, National Taiwan University, Taipei, Taiwan.
2 Department of Cardiovascular Medicine, Sapporo Cardiovascular Clinic, Sapporo Heart Center, Sapporo, Japan. Electronic address: kuramitsu@heart-kizuna.com.
3 Department of Cardiovascular Medicine, Sapporo Cardiovascular Clinic, Sapporo Heart Center, Sapporo, Japan.
4 Division of Cardiology, Department of Internal Medicine, Taipei Veterans General Hospital, Taipei, Taiwan; Department of Internal Medicine, School of Medicine, College of Medicine, National Yang Ming Chiao Tung University, Taipei, Taiwan.