[1] Trondheim Reg & Univ Hosp, Dept Neurol, Trondheim, Norway
[2] Trondheim Reg & Univ Hosp, Dept Clin Med, Trondheim, Norway
[3] Univ Bergen, Bergen, Norway
[4] Harvard TH Chan Sch Publ Hlth, Dept Nutr, Boston, MA USA
[5] Univ Bergen, Dept Global Publ Hlth & Primary Care, Bergen, Norway
[6] Haukeland Hosp, Dept Clin Med, Bergen, Norway
[7] Univ Bergen, Bergen, Norway
[8] Akershus Univ Hosp, Dept Neurol, Lorenskog, Norway
[9] Molde Hosp, Molde, Norway
[10] Stavanger Univ Hosp, Stavanger, Norway
[11] Skien Hosp, Skien, Norway
[12] Vestre Viken Hosp, Drammen, Norway
[13] Sorlandet Hosp Arendal, Arendal, Norway
[14] Ostfold Hosp Kalnes, Fredrikstad, Norway
[15] Oslo Univ Hosp, Dept Neurol, Oslo, Norway
[16] Oslo Univ Hosp, Inst Clin Med, Oslo, Norway
[17] Univ Oslo, Oslo, Norway
[18] Lillehammer Hosp, Lillehammer, Norway
[19] Haugesund Hosp, Haugesund, Norway
[20] Nordland Hosp, Bodo, Norway
[21] Haukeland Hosp, Dept Neurol, Bergen, Norway
[22] Haukeland Hosp, Dept Clin Med, Bergen, Norway