1. Graduate School of Health Sciences, Hokkaido University, Sapporo, Japan.
2. Faculty of Health Sciences, Hokkaido University of Science, Sapporo, Japan.
3. Faculty of Health Sciences, Hokkaido University, Sapporo, Japan.
4. Department of Radiology, KKR Sapporo Medical Center, Sapporo, Japan.
5. Department of Medical Informatics and Hospital Management, Asahikawa Medical University, Asahikawa-City, Hokkaido.