[1] Univ Turku, Dept Neurol, Turku 20014, Finland
[2] Univ Oulu, Dept Neurol, Oulu, Finland
[3] Oulu Univ Hosp, Clin Res Ctr, Oulu, Finland
[4] Univ Turku, Dept Med Genet, Turku, Finland
[5] Oulu Univ Hosp, Dept Clin Genet, Oulu, Finland
[6] Univ Tampere, Inst Med Technol, FIN-33101 Tampere, Finland
[7] Univ Helsinki, Dept Med Genet, Helsinki, Finland
[8] Univ Helsinki, Cent Hosp, Dept Clin Genet, Helsinki, Finland
[9] Univ Turku, Dept Geriatr Med, Turku, Finland
[10] Karolinska Univ Hosp, Karolinska Inst, Div Clin Geriatr, Stockholm, Sweden
[11] Univ Helsinki, Dept Pathol, Helsinki, Finland
[12] Univ Helsinki, Cent Hosp, Dept Pathol, Helsinki, Finland
[13] Univ Turku, Dept Pathol, Turku, Finland