1 Department of Radiology, Kanagawa Cardiovascular and Respiratory Center, 6-16-1, Tomioka-higashi, Kanazawa-ku, Yokohama, 236-8651, Japan. tae_i_md@wb3.so-net.ne.jp.
2 Department of Diagnostic Radiology, School of Medicine, Yokohama City University, Yokohama, Japan. tae_i_md@wb3.so-net.ne.jp.
3 Respiratory Medicine in Kanagawa Cardiovascular and Respiratory Center, 6-16-1, Tomioka-higashi, Kanazawa-ku, Yokohama, 236-8651, Japan.
4 Department of Radiology, Kanagawa Cardiovascular and Respiratory Center, 6-16-1, Tomioka-higashi, Kanazawa-ku, Yokohama, 236-8651, Japan.
5 Department of Diagnostic Radiology, School of Medicine, Yokohama City University, Yokohama, Japan.