[1] Sugiuchi Clin, Dept Otolaryngol, 2-7-4 Jiyugaoka,Meguro Ku, Tokyo 1520035, Japan
[2] Kotoba No Mori Child Dev Support & After Sch Dayca, 2-7-4-2F Jiyugaoka,Meguro Ku, Tokyo 1520035, Japan
[3] Kanto Rosai Hosp, Dept Otolaryngol, 1-1 Kizukisumiyoshi Cho,Nakahara Ku, Kawasaki, Kanagawa 2118510, Japan
[4] Prefectural Univ Hiroshima, Fac Hlth & Welf, Dept Commun Sci & Disorders, 1-1 Gakuen Cho, Mihara, Hiroshima 7230053, Japan
[5] Kawasaki City Cent Rehabil Ctr, 3-16-1 Ida,Nakahara Ku, Kawasaki, Kanagawa 2110035, Japan