1 Department of Radiology, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, 465 Kajiicho Kawaramachi Hirokoji, Kamigyo-ku, 602-8566, Kyoto, Japan. hideya10@hotmail.com.
2 Department of Radiology, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, 465 Kajiicho Kawaramachi Hirokoji, Kamigyo-ku, 602-8566, Kyoto, Japan.
3 Department of Radiology, Kansai Medical University, 573-1010, Hirakata, Japan.