[1] Univ Iowa Hosp & Clin, Dept Otolaryngol Head & Neck Surg, 200 Hawkins Dr, Iowa City, IA 52242 USA
[2] Univ Calgary, Sect Otolaryngol Head & Neck Surg, Dept Surg, Calgary, AB, Canada
[3] Univ Auckland, Dept Otolaryngol Head & Neck Surg, Auckland, New Zealand
[4] Univ Washington, Dept Surg, Minimally Invas Surg, Surg Crit Care,Seattle VA Med Ctr, Seattle, WA 98195 USA
[5] Med Coll Wisconsin, Dept Otolaryngol & Commun Sci, Milwaukee, WI 53226 USA
[6] Med Coll Wisconsin, Dept Microbiol & Immunol, Milwaukee, WI 53226 USA