1. Department of Radiology , Aichi Medical University , Aichi , Japan
2. Department of Respiratory Medicine and Allergology , Aichi Medical University , Aichi , Japan
3. Department of Central Radiology , Aichi Medical University , Aichi , Japan
4. Department of Biostatistics, Clinical Research Center , Aichi Medical University , Aichi , Japan
5. Division of Chest Surgery, Department of Surgery , Aichi Medical University , Aichi , Japan