[1] Royal Adelaide Hosp, Dept Otorhinolaryngol Head & Neck Surg, Adelaide, SA, Australia
[2] Flinders Univ S Australia, Flinders Med Ctr, Dept Otorhinolaryngol Head & Neck Surg, Bedford Pk, SA, Australia
[3] Flinders Private Hosp, Bedford Pk, SA, Australia
[4] Mem Hosp, Adelaide, SA, Australia
[5] Calvary Cent Dist Hosp, Elizabeth Vale, SA, Australia