1. Department of Cardiovascular Medicine (Fujita, Sugioka, Matsumura, Ito, Hozumi, Hasegawa, Hanatani, Yoshiyama); Osaka City University Graduate School of Medicine; Osaka; Japan
2. Department of Cardiology (Naruko); Osaka City General Hospital; Osaka; Japan
3. Department of Pathology (Ueda); Osaka City University Graduate School of Medicine; Osaka; Japan