[1] Univ Instelling Antwerp, Dept Mol Genet, B-2610 Antwerp, Belgium
[2] Univ Antwerp Hosp, Div Neurol, Antwerp, Belgium
[3] Univ Antwerp Hosp, Neuromuscular Reference Ctr, Antwerp, Belgium
[4] Flanders Interuniv Inst Biotechnol VIB8, Dept Mol Genet, Antwerp, Belgium
[5] Born Bunge Fdn, Dept Neuropathol, Antwerp, Belgium
[6] Univ Helsinki, Program Neurosci, Helsinki, Finland
[7] Univ Helsinki, Dept Neurol, Helsinki, Finland
[8] Univ Helsinki, Cent Hosp, Dept Neurol, Helsinki, Finland
[9] Seinajoki Cent Hosp, Dept Phys Med, Seinajoki, Finland
[10] Seinajoki Cent Hosp, Dept Rehabil & Neurol, Seinajoki, Finland
[11] Atkinson Morelys Hosp, Dept Neurol, London, England
[12] Univ Helsinki, Dept Med Genet, Folkhalsan Inst Genet, Helsinki, Finland
[13] Univ Texas, MD Anderson Canc Ctr, Sect Canc Genet, Dept Mol Genet, Houston, TX 77030 USA
[14] Vaasa Cent Hosp, Vaasa, Finland
[15] Tampere Univ Hosp, Tampere, Finland