作者单位:Eastern Virginia Med Sch, Dept Otolaryngol Head & Neck Surg, Norfolk, VA 23501 USA[1]Cincinnati Childrens Hosp Med Ctr, Dept Otolaryngol, Cincinnati, OH 45229 USA[2]McLaren Oakland Hosp, Otolaryngol & Facial Plast Surg, 50 N Perry St, Pontiac, MI 48342 USA[3]Kaiser Permanente, Dept Head & Neck Surg, Oakland, CA USA[4]Nemours Al DuPont Hosp Children, Div Otolaryngol, Wilmington, DE USA[5]