[1] Univ Arkansas Med Sci, Div Pediat Cardiol, Little Rock, AR 72205 USA
[2] Univ Arkansas Med Sci, Div Crit Care, Little Rock, AR 72205 USA
[3] Stanford Univ, Sch Med, Div Pediat Cardiol, Dept Pediat, Palo Alto, CA 94304 USA
[4] Stanford Univ, Sch Med, Dept Med Educ, Palo Alto, CA 94304 USA
[5] Univ Arkansas Med Sci, Div Biostat, Dept Pediat, Little Rock, AR 72205 USA
[6] Lucile Packard Childrens Hosp, Dept Qual Management, Palo Alto, CA USA
[7] Univ Sch Med, Div Pediat Crit Care, Palo Alto, CA USA
[8] Univ Sch Med, Div Neonatal & Dev Med, Palo Alto, CA USA
[9] Univ Penn, Sch Med, Dept Anesthesia & Crit Care, Philadelphia, PA 19104 USA