1. Department of Radiology, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto, Japan
2. Department of Radiology, Kochi University, Kochi, Japan
3. Department of Diagnostic Radiology, Institute and Graduate School of Biomedical Sciences, Hiroshima University, Hiroshima, Japan
4. Division of Chest Surgery, Department of Surgery, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto, Japan