[1] Oregon Hlth & Sci Univ, Doernbecher Childrens Hosp, Dept Pediat, 3181 Sw Sam Jackson Pk Rd, Portland, OR 97201 USA
[2] Univ Cincinnati, Coll Med, Dept Pediat, Cincinnati, OH USA
[3] Cincinnati Childrens Hosp Med Ctr, Heart Inst, Cincinnati, OH 45229 USA
[4] Northwestern Univ, Feinberg Sch Med, Chicago, IL 60611 USA
[5] Ann & Robert H Lurie Childrens Hosp Chicago, Div Cardiol, Chicago, IL 60611 USA
[6] Boston Childrens Hosp, Dept Cardiol, Boston, MA USA
[7] Seattle Childrens Hosp, Div Cardiol, Seattle, WA USA
[8] Childrens Mercy Hosp, Ward Family Heart Ctr, Kansas City, MO 64108 USA
[9] Washington Univ, Sch Med, Div Pediat Cardiol, St Louis, MO USA
[10] Childrens Hosp Philadelphia, Div Cardiol, Philadelphia, PA 19104 USA
[11] Alfred I DuPont Hosp Children, Nemours Cardiac Ctr, Wilmington, DE USA
[12] Texas Childrens Hosp, Dept Cardiol, Houston, TX 77030 USA
[13] Univ Vermont, Div Pediat Cardiol, Burlington, VT USA