1. Department of Cardiovascular Medicine, National Cerebral and Cardiovascular Center, 5-7-1 Fujishiro-dai, Suita, Osaka, Japan
2. Department of Advanced Cardiovascular Medicine, Graduate School of Medical Sciences, Kumamoto University, 1-1-1 Honjo, Chuo-ku, Kumamoto, Japan
3. Department of Radiology, National Cerebral and Cardiovascular Center, 5-7-1 Fujishiro-dai, Suita, Osaka, Japan
4. Research and Collaboration Department, Siemens Healthcare K.K., Gate City Osaki West Tower, 1-11-1, Osaki Shinagawa-ku, Tokyo, Japan