[1] Univ Utah, Dept Human Genet & Mol Biol, Salt Lake City, UT USA
[2] Univ Utah, Howard Hughes Med Inst, Salt Lake City, UT USA
[3] Univ Utah, Dept Neurol, Salt Lake City, UT USA
[4] Univ Utah, Dept Pediat Cardiol, Salt Lake City, UT USA
[5] Univ Rochester, Neuromuscular Dis Ctr, Sch Med & Dent, Rochester, NY 14627 USA
[6] Childrens Mercy Hosp, Dept Pediat, Toledo, OH USA
[7] Univ Virginia Hlth Syst, Dept Pediat, Charlottesville, VA USA
[8] Univ Virginia Hlth Syst, Dept Biochem & Mol Genet, Charlottesville, VA USA
[9] George Washington Univ, Childrens Natl Med Ctr, Dept Neurol, Washington, DC USA
[10] George Washington Univ, Childrens Natl Med Ctr, Med Genet Res Ctr, Washington, DC USA
[11] Univ Calif Irvine, Dept Neurol, Irvine, CA 92717 USA
[12] Univ Calif San Francisco, Dept Neurol, San Francisco, CA 94143 USA
[13] Univ Nice, Inst Pharmacol Mol & Cellulaire, Sophia Antipolis, France
[14] Fac Med Timone, INSERM, U491, Genet Med & Dev, Marseille, France
[15] Hosp Donostia, Unidad Genet, San Sebastian, Spain
[16] Hosp Donostia, Serv Neurol, San Sebastian, Spain
[17] Univ London St Georges Hosp, Sch Med, London SW17 0RE, England