[1] Univ Colorado, Sch Med, Dept Otolaryngol, Aurora, CO USA
[2] Childrens Hosp Colorado, Aurora, CO USA
[3] Univ Washington, Dept Otolaryngol Head & Neck Surg, Seattle, WA 98195 USA
[4] Seattle Childrens Hosp, Seattle, WA USA
[5] Cincinnati Childrens Hosp Med Ctr, Div Pediat Otolaryngol Head & Neck Surg, Cincinnati, OH 45229 USA
[6] Cincinnati Childrens Hosp Med Ctr, Div Pulm Med, Cincinnati, OH 45229 USA
[7] Univ Cincinnati, Coll Med, Dept Otolaryngol Head & Neck Surg, Cincinnati, OH USA
[8] Univ Texas Southwestern Med Ctr Dallas, Childrens Med Ctr, Div Pediat Otolaryngol, Dept Otolaryngol Head & Neck Surg, Dallas, TX 75390 USA
[9] Vanderbilt Univ, Med Ctr, Dept Otolaryngol, Nashville, TN 37232 USA
[10] Stanford Univ, Sch Med, Lucile Packard Childrens Hosp, Div Pediat Otolaryngol, Stanford, CA USA
[11] Univ Calif San Francisco, Dept Otolaryngol Head & Neck Surg, San Francisco, CA 94143 USA
[12] Univ Calif San Francisco, Div Pediat Otolaryngol Head & Neck Surg, San Francisco, CA 94143 USA
[13] Univ Alberta, Div Otolaryngol Head & Neck Surg, Dept Surg, Edmonton, AB, Canada
[14] Univ Alberta, Div Otolaryngol Head & Neck Surg, Dept Pediat, Edmonton, AB, Canada
[15] Univ Alberta, Div Pediat Surg, Dept Surg, Edmonton, AB, Canada
[16] Univ Alberta, Div Pediat Surg, Dept Pediat, Edmonton, AB, Canada