1. Center for Cause of Death Investigation, Faculty of Medicine, Hokkaido University
2. Department of Diagnostic and Interventional Radiology, Hokkaido University Hospital
3. Department of Cardiovascular Medicine, Hokkaido University Graduate School of Medicine
4. Department of Nuclear Medicine, Hokkaido University Graduate School of Medicine
5. Faculty of Health Sciences, Hokkaido University
6. Department of Cardiovascular Medicine, Kyushu University
7. Department of Radiology, Kyoto Prefectural University of Medicine
8. Department of Radiation Medicine, Hokkaido University Graduate School of Medicine