[1] Univ Gothenburg, Sahlgrenska Univ Hosp, Sahlgrenska Acad, Dept Med, Gothenburg, Sweden
[2] Univ Gothenburg, Sahlgrenska Univ Hosp, Sahlgrenska Acad, Dept Cardiol, Gothenburg, Sweden
[3] Kungalv Hosp, Dept Geriatr Neurol & Rehabil, Kungalv, Sweden
[4] Sodra Alvsborgs Hosp, Dept Neurol, Boras, Sweden
[5] Univ Gothenburg, Sahlgrenska Univ Hosp, Sahlgrenska Acad, Dept Med, Per Dubbsgatan, S-41345 Gothenburg, Sweden