[1] Seattle Childrens Hosp, Div Pediat Otolaryngol, Seattle, WA USA
[2] Univ Washington, Sch Med, 1959 NE Pacific St, Seattle, WA 98195 USA
[3] Univ Missouri Kansas City, Sch Med, Dept Surg, Kansas City, MO USA
[4] Univ Kansas, Sch Med, Dept Otolaryngol Head & Neck Surg, Kansas City, MO USA
[5] Univ Washington, Sch Med, Dept Otolaryngol Head & Neck Surg, Seattle, WA USA
[6] Seattle Childrens Res Inst, Ctr Resp Biol & Therapeut, Seattle, WA USA
[7] Seattle Childrens Res Inst, Biostat Epidemiol & Analyt Res, Seattle, WA USA
[8] Seattle Childrens Res Inst, Ctr Clin & Translat Res, Seattle, WA USA