[1] Harvard Univ, Sch Med, Dept Genet, Boston, MA 02115 USA
[2] Childrens Hosp, Dept Cardiol, Boston, MA 02115 USA
[3] Howard Hughes Med Inst, Boston, MA 02115 USA
[4] Duke Univ, Dept Cardiol, Durham, NC USA
[5] Minneapolis Heart Inst Fdn, Minneapolis, MN USA
[6] Brigham & Womens Hosp, Dept Cardiol, Boston, MA 02115 USA