[1] Childrens Hosp Reg Med Ctr, Dept Anesthesiol & Pain Med, Seattle, WA 98105 USA
[2] Childrens Hosp Reg Med Ctr, Dept Pediat, Div Pediat Cardiol, Seattle, WA 98105 USA
[3] Childrens Hosp Reg Med Ctr, Dept Surg, Sect Pediat Cardiac Surg, Seattle, WA 98105 USA
[4] Univ Washington, Sch Med, Seattle, WA 98195 USA