1. Department of Cardiology, Kawasaki Medical School, Kurashiki, Okayama, Japan.
2. Department of Cardiology, Okayama Kyokuto Hospital, Okayama, Japan.
3. Department of Nuclear Medicine, Kawasaki Medical School, Kurashiki, Okayama, Japan.
4. Department of Radiological Technology, Kawasaki Medical School, Kurashiki, Okayama, Japan.