[1] Telemark Hosp Trust, Dept Med Genet, Skien, Norway
[2] Univ Oslo, Inst Clin Med, Oslo, Norway
[3] Nordland Hosp Trust, Dept Neurol, Bodo, Norway
[4] Vestre Viken Hosp Trust, Dept Neurol, Drammen, Norway
[5] Ostfold Hosp Trust, Dept Neurol, Gralum, Norway
[6] Vestfold Hosp Trust, Dept Neurol, Tonsberg, Norway
[7] Telemark Hosp Trust, Dept Neurol, Skien, Norway
[8] Fonna Hosp Trust, Dept Neurol, Haugesund, Norway
[9] Univ Hosp North Norway, Dept Neurol, Tromso, Norway
[10] Innlandet Hosp Trust, Dept Neurol, Lillehammer, Norway
[11] Trondheim Reg & Univ Hosp, Dept Neurol & Clin Neurophysiol, Trondheim, Norway
[12] Norwegian Univ Sci & Technol, Dept Neuromed & Movement Sci, Trondheim, Norway
[13] Sorlandet Hosp Trust, Dept Neurol, Kristiansand, Norway
[14] Univ Bergen, Dept Clin Med, Bergen, Norway
[15] Oslo Univ Hosp, Dept Neurol, Oslo, Norway
[16] More Romsdal Hosp Trust, Dept Neurol, Molde, Norway
[17] Stavanger Univ Hosp, Dept Neurol, Stavanger, Norway
[18] Nord Trondelag Hosp Trust, Dept Neurol, Namsos, Norway
[19] Haukeland Hosp, Dept Neurol, Bergen, Norway
[20] Akershus Univ Hosp, Dept Neurol, Lorenskog, Norway