[1] Univ Oulu, Dept Neurol, Oulu, Finland
[2] MHSO, Dept Neurol, Pietarsaari, Finland
[3] Univ Helsinki, Family Federat Finland, FIN-00014 Helsinki, Finland
[4] Univ Helsinki, Dept Pathol, FIN-00014 Helsinki, Finland
[5] Univ Helsinki, Folkhalsan Inst Genet, FIN-00014 Helsinki, Finland
[6] Univ Helsinki, Ctr Neurosci, FIN-00014 Helsinki, Finland
[7] Univ Helsinki, Dept Med Genet, FIN-00014 Helsinki, Finland