1 The Center for Advanced Medical Engineering and Informatics, Osaka University, 2-2 Yamadaoka, Suita, 565-0871, Japan. kazuhiro@medone.med.osaka-u.ac.jp.
2 Department of Cardiovascular Medicine, Osaka University Graduate School of Medicine, Suita, Japan. kazuhiro@medone.med.osaka-u.ac.jp.
3 Department of Cardiovascular Medicine, Osaka University Graduate School of Medicine, Suita, Japan.