[1] Leiden Univ, Dept Human Genet, Med Ctr, NL-2300 RA Leiden, Netherlands
[2] Leiden Univ, Dept Clin Genet, Med Ctr, Leiden, Netherlands
[3] Univ Hosp Leuven, Dept Pediat Neurol, Louvain, Belgium
[4] Univ Gothenburg, Dept Pediat, Gothenburg, Sweden
[5] Leiden Univ, Dept Neurol, Med Ctr, Leiden, Netherlands
[6] Prosensa Therapeut, Leiden, Netherlands