1. Department of Radiology, Hirosaki University Hospital, Hirosaki, Aomori 036‑8563, Japan
2. Department of Stress Response Science, Biomedical Research Center, Hirosaki University Graduate School of Medicine, Hirosaki, Aomori 036‑8562, Japan
3. Department of Radiation Science, Hirosaki University Graduate School of Health Sciences, Hirosaki, Aomori 036‑8564, Japan