1. Department of Radiology, Yamaguchi University Graduate School of Medicine, Ube, Japan
2. Department of Radiology, National Hospital Organization Yamaguchi - Ube Medical Center, Ube, Japan
3. Department of Pathology, KYURIN / KYURIN PACELL Corporation, Kitakyushu, Japan
4. Department of Biostatistics, Yamaguchi University, Ube, Japan
5. Department of Respiratory Medicine, National Hospital Organization Yamaguchi - Ube Medical Center, Ube, Japan