[1] MedStar Georgetown Univ Hosp, Dept Otolaryngol Head & Neck Surg, Washington, DC USA
[2] Childrens Hosp Philadelphia, Dept Anesthesia & Crit Care, Philadelphia, PA 19104 USA
[3] Univ Michigan Hlth Syst, Dept Otolaryngol Head & Neck Surg, Ann Arbor, MI 48109 USA