1. Department of Diagnostic Radiology and Nuclear Medicine, Gunma University Graduate School of Medicine, Maebashi, Gunma, Japan
2. Radiological Sciences, School of Medicine, University of Nottingham, Nottingham, United Kingdom
3. Department of Radiology, Gunma University Hospital, Maebashi, Gunma, Japan
4. NIHR Nottingham Biomedical Research Centre, Nottingham, United Kingdom