[1] Childrens Natl Med Ctr, Div Otolaryngol, Washington, DC 20010 USA
[2] Icahn Sch Med Mt Sinai, Med Ctr, Dept Surg, New York, NY 10029 USA
[3] Univ Calif Los Angeles, David Geffen Sch Med, Div Gen Internal Med & Hlth Serv Res, Los Angeles, CA 90095 USA
[4] Nationwide Childrens Hosp, Dept Otolaryngol Head & Neck Surg, Columbus, OH USA
[5] Ohio State Univ, Wexner Med Ctr, Columbus, OH 43210 USA
[6] Boston Childrens Hosp, Dept Surg, Boston, MA USA
[7] Harvard Univ, Sch Med, Boston, MA USA
[8] Johns Hopkins Univ, Sch Med, Dept Otolaryngol, Baltimore, MD 21287 USA
[9] Johns Hopkins Bloomberg Sch Publ Hlth, Dept Hlth Policy & Management, Baltimore, MD USA