[1] Wilfrid Laurier Univ, Waterloo, ON, Canada
[2] Univ Minnesota, Minneapolis, MN 55455 USA
[3] Univ Texas Austin, Austin, TX 78712 USA
[4] Chongqing Med Univ, Affiliated Hosp Chengdu 2, Peoples Hosp Chengdu 3, Dept Gen Surg, Qinglong St 82, Chengdu, Sichuan, Peoples R China
[5] Sichuan Acad Med Sci, Dept Otorhinolaryngol, Chengdu, Sichuan, Peoples R China
[6] Sichuan Prov Peoples Hosp, Chengdu, Sichuan, Peoples R China