1. Department of Cardiovascular Medicine Kyoto University Graduate School of Medicine Kyoto Japan
2. Department of Cardiovascular Medicine Niigata City General Hospital Niigata Japan
3. Department of Bioscience and Genetics National Cerebral and Cardiovascular Center Osaka Japan
4. Vanderbilt Center for Arrhythmia Research and Therapeutics Division of Clinical Pharmacology Department of Medicine Vanderbilt University Medical Center Nashville TN USA
5. Department of Cardiovascular Medicine Shiga University of Medical Science Shiga Japan