[1] Stanford Univ, Div Hosp Med, Dept Pediat, Sch Med, 300 Pasteur Dr,Mail Code 5776, Stanford, CA 94305 USA
[2] Seattle Childrens Hosp, Dept Pediat, Seattle, WA USA
[3] Univ Wisconsin, Dept Pediat, Sch Med & Publ Hlth, Madison, WI USA
[4] Univ Utah, Dept Pediat, Primary Childrens Hosp, Div Pediat Crit Care, Salt Lake City, UT USA
[5] Harvard Med Sch, Boston Childrens Hosp, Dept Pediat, Div Cardiol, Boston, MA 02115 USA
[6] Univ Cincinnati, Dept Pediat, Cincinnati Childrens Hosp Med Ctr, Div Hosp Med, Cincinnati, OH USA
[7] Univ Colorado Denver, Childrens Hosp Colorado, Sect Hosp Med, Dept Pediat, Aurora, CO USA
[8] Stanford Univ, Quantitat Sci Unit, Palo Alto, CA 94304 USA
[9] Texas Childrens Hosp, Baylor Coll Med, Dept Pediat, Sect Hosp Med, Houston, TX 77030 USA
[10] Stanford Univ, Sch Med, Dept Pediat, Div Crit Care, Palo Alto, CA 94304 USA