[1] Mayo Clin, Dept Pediat, Div Pediat Cardiol, Rochester, MN 55905 USA
[2] Mayo Clin, Dept Mol Pharmacol & Expt Therapeut, Rochester, MN 55905 USA
[3] Mayo Clin, Dept Neurol, Div Epilepsy, Rochester, MN 55905 USA
[4] Mayo Clin, Dept Med, Div Cardiovasc Dis, Rochester, MN 55905 USA
[5] Univ Amsterdam, Acad Med Ctr, Dept Clin Genet, NL-1105 AZ Amsterdam, Netherlands
[6] Univ Amsterdam, Acad Med Ctr, Dept Cardiol, NL-1105 AZ Amsterdam, Netherlands