[1] George Washington Univ, Med Ctr, Childrens Natl Med Ctr, Div Otolaryngol, Washington, DC 20010 USA
[2] Washington Univ, Sch Med, Dept Otolaryngol, St Louis, MO 63110 USA
[3] St Johns Hosp & Clin, Springfield, MO USA
[4] Univ Missouri, Columbia, MO 65211 USA
[5] Virginia Mason Med Ctr, Dept Otolaryngol, Seattle, WA 98101 USA
[6] Amer Acad Otolaryngol Head & Neck Surg, Alexandria, VA USA
[7] Childrens Hosp Boston, Dept Otolaryngol & Commun Dis, Boston, MA USA
[8] Harvard Univ, Sch Med, Boston, MA USA