Costello John M, Vitullo Dolores A, Yan Peng, Backer Carl L, Mavroudis Constantine
Division of Cardiology, Children's Memorial Hospital, The Feinberg School of Medicine at Northwestern University, Chicago, Ill 60614-3394, USA.
Circulation. 2003 Feb 25;107(7):1066-7. doi: 10.1161/01.cir.0000056030.29293.06.