1. Department of Radiation Science, Hirosaki University Graduate School of Health Sciences, Hirosaki, Aomori 036‑8564, Japan
2. Department of Radiology, Southern Tohoku General Hospital, Koriyama, Fukushima 963‑8052, Japan
3. Department of Bioscience and Laboratory Medicine, Hirosaki University Graduate School of Health Sciences, Hirosaki, Aomori 036‑8564, Japan
4. Department of Radiology, Aomori Rosai Hospital, Hachinohe, Aomori 031‑8551, Japan
5. Department of Molecular Biosciences, The Wenner‑Gren Institute, Stockholm University, SE‑10691 Stockholm, Sweden