[1] German Canc Res Ctr, Dept Med & Biol Informat, DKFZ, D-69120 Heidelberg, Germany
[2] German Heart Inst, Dept Congenital Heart Dis & Pediat Cardiol & Card, Berlin, Germany
[3] Philips Med Syst, Hamburg, Germany
[4] Harvard Univ, Sch Med, Childrens Hosp, Cardiac Registry,Dept Pathol, Boston, MA 02115 USA