[1] Univ Chicago, Pritzker Sch Med, Sect Otolaryngol Head & Neck Surg, Chicago, IL 60637 USA
[2] Alaska Native Med Ctr, Dept Otolaryngol Head & Neck Surg, Anchorage, AK USA
[3] Univ Chicago, Pritzker Sch Med, Dept Anesthesiol Crit Care, Chicago, IL 60637 USA
[4] Univ Chicago, Simulat Ctr, Chicago, IL 60637 USA