[1] Stanford Univ, Sch Med, Lucile Packard Childrens Hosp, Div Pediat Cardiac Surg, Stanford, CA 94305 USA
[2] Stanford Univ, Sch Med, Lucile Packard Childrens Hosp, Div Pediat Otorhinolaryngol, Stanford, CA 94305 USA
[3] Stanford Univ, Sch Med, Lucile Packard Childrens Hosp, Div Pediat Anesthesiol, Stanford, CA 94305 USA