[1] Childrens Healthcare Atlanta, Atlanta, GA USA
[2] Emory Univ, Sch Med, Atlanta, GA USA
[3] Pediat Cardiol Associates, St Petersburg, FL USA
[4] Univ S Florida, All Childrens Hosp, St Petersburg, FL 33701 USA
[5] Lucille Packard Hosp, Stanford, CA USA
[6] Stanford Univ, Palo Alto, CA 94304 USA
[7] Childrens Hosp Philadelphia, Philadelphia, PA 19104 USA
[8] Univ Penn, Sch Med, Philadelphia, PA 19104 USA
[9] UCL, Cardiac Unit, Inst Child Hlth, London, England