[1] Kurume Univ Hosp, Dept Diagnost Pathol, Kurume, Fukuoka 8300011, Japan
[2] Sakai Municipal Hosp, Dept Pathol & Res, Sakai, Osaka, Japan
[3] Kurume Univ, Sch Med, Dept Otolaryngol Head & Neck Surg, Kurume, Fukuoka 830, Japan
[4] Kurume Univ, Sch Med, Dept Pathol, Kurume, Fukuoka 830, Japan