[1] Policlin San Matteo, IRCCS, Dept Cardiol, I-27100 Pavia, Italy
[2] Univ Pavia, Dept Cardiol, I-27100 Pavia, Italy
[3] Univ Virginia, Charlottesville, VA USA
[4] Med Univ S Carolina, Childrens Heart Program S Carolina, Charleston, SC 29425 USA
[5] IRCCS, Ist Auxol Italiano, Pediat Arrhythmias Ctr, Milan, Italy
[6] Univ Penn, Childrens Hosp Philadelphia, Sch Med, Dept Pediat,Div Pediat Cardiol, Philadelphia, PA 19104 USA
[7] Hop Necker Enfants Malad, Dept Pediat, Div Pediat Cardiol, Paris, France
[8] Freeman Rd Hosp, Dept Paediat Cardiol, Newcastle Upon Tyne NE7 7DN, Tyne & Wear, England