1. Department of Cardiovascular Medicine, Kyoto University Graduate School of Medicine , Kyoto , Japan
2. Department of Cardiovascular Medicine, Shiga University of Medical Science , Setatsukinowacho, Otsu, Shiga 520-2192 , Japan
3. Department of Medicine, Vanderbilt University Medical Center , 2215B Garland Ave, 1275 MRBIV, Nashville, TN 37232 , USA
4. Department of Cardiovascular Medicine, Faculty of Medical Sciences, University of Fukui , Fukui , Japan
5. Department of Public Health, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Science , Okayama , Japan
6. Department of Bioscience and Genetics, National Cerebral and Cardiovascular Center , Osaka , Japan
7. Division of Cardiology, Hirakata Kohsai Hospital , Osaka , Japan