[1] Nagasaki Univ, Grad Sch Biomed Sci, Dept Otolaryngol Head & Neck Surg, Nagasaki 8528501, Japan
[2] Nagasaki Bell Hearing Ctr, Nagasaki, Japan
[3] Nishiisahaya Hosp, Dept Radiol, Nagasaki, Japan
[4] Nishiisahaya Hosp, Dept Orthoped Surg, Nagasaki, Japan
[5] Ureshino Med Ctr, Dept Otolaryngol Head & Neck Surg, Saga, Japan