[1] Univ Iowa Hosp & Clin, Pediat Anesthesia, Dept Anesthesiol, Iowa City, IA 52242 USA
[2] Univ Iowa Hosp & Clin, Dept Pediat, Iowa City, IA 52242 USA
[3] Univ Iowa Hosp & Clin, Pediat Dermatol, Dept Dermatol, Iowa City, IA USA
[4] Univ Iowa Hosp & Clin, Pediat Otolaryngol, Dept Otolaryngol Head & Neck Surg, Iowa City, IA USA