[1] Shanghai Jiao Tong Univ, Affiliated Peoples Hosp 6, Dept Otolaryngol, Shanghai 200233, Peoples R China
[2] Shanghai Jiao Tong Univ, Otolaryngol Inst, Shanghai 200030, Peoples R China
[3] Dalhousie Univ, Sch Human Commun Disorders, Halifax, NS, Canada
[4] Miyoshi ENT Clin, Sendai, Miyagi, Japan