[1] Keio Univ, Sch Med, Dept Plast & Reconstruct Surg, Shinjuku Ku, Tokyo 1608582, Japan
[2] Natl Tokyo Med Ctr, Dept Plast & Reconstruct Surg, Meguro Ku, Tokyo 1528902, Japan
[3] Natl Tokyo Med Ctr, Dept Otorhinolaryngol, Meguro Ku, Tokyo 1528902, Japan
[4] Keio Univ, Sch Med, Dept Otorhinolaryngol, Shinjuku Ku, Tokyo 1608582, Japan
[5] Funabashi Municipal Med Ctr, Dept Otorhinolaryngol, Funabashi, Chiba 2738588, Japan
[6] Natl Tokyo Med Ctr, Clin Res Ctr, Div Clin Epidemiol, Meguro Ku, Tokyo 1528902, Japan