[1] Weill Cornell Med Coll, Sean Parker Inst Voice, Dept Otolaryngol, New York, NY USA
[2] Stanford Univ, Dept Anesthesiol, Div Pediat Anesthesiol, Stanford, CA 94305 USA
[3] Stanford Univ, Dept Pediat, Div Pediat Crit Care Med, Stanford, CA 94305 USA
[4] Stanford Univ, Dept Otolaryngol Head & Neck Surg, Div Pediat Otolaryngol, Stanford, CA 94305 USA
[5] Stanford Univ, Stanford Pediat Aerodigest Ctr, Stanford, CA 94305 USA
[6] Stanford Univ, Sch Med, Stanford, CA 94305 USA
[7] Lucile Packard Childrens Hosp Stanford, Dept Clin Informat, Palo Alto, CA USA