[1] Ehime Univ, Sch Med, Toon, Ehime, Japan
[2] Ehime Univ, Grad Sch Med, Dept Radiol, Toon, Ehime, Japan
[3] Natl Hosp Org Shikoku Canc Ctr, Dept Diagnost Radiol, Matsuyama, Ehime, Japan
[4] Ehime Univ Hosp, Ctr Canc, Toon, Ehime, Japan
[5] Ehime Univ, Grad Sch Med, Dept Clin Oncol, Toon, Ehime 7910295, Japan
[6] Ehime Univ, Grad Sch Med, Dept Epidemiol & Prevent Med, Toon, Ehime, Japan
[7] Ehime Univ Hosp, Translat Res Ctr, Res Promot Unit, Toon, Ehime, Japan