1. Division of Functional and Diagnostic Imaging Research, Department of Radiology and Advanced Biomedical Imaging Research Center, Kobe University Graduate School of Medicine, Kobe, Hyogo, Japan

2. Division of Radiology, Department of Radiology, Kobe University School of Medicine, Kobe, Hyogo, Japan

3. Department of Radiology, Nara Medical University, Kashihara, Nara, Japan