[1] Radboud Univ Nijmegen, Med Ctr, Dept Neurol, 935 POB 9101, NL-6500 HB Nijmegen, Netherlands
[2] Gelre Hosp, Dept Neurol, Zutphen, Netherlands
[3] Ziekenhuisgroep Twente, Dept Neurol, Almelo, Netherlands
[4] Leiden Univ, Med Ctr, Dept Human Genet, Leiden, Netherlands