[1] Huddinge Hosp, Dept Neurol, S-14186 Huddinge, Sweden
[2] Huddinge Hosp, Dept Clin Neurophysiol, S-14186 Huddinge, Sweden
[3] Huddinge Hosp, Dept Pathol, S-14186 Huddinge, Sweden
[4] Linkoping Univ Hosp, Dept Neurol, S-58185 Linkoping, Sweden
[5] Linkoping Univ Hosp, Dept Clin Neurophysiol, S-58185 Linkoping, Sweden
[6] Linkoping Univ Hosp, Dept Transfus Med & Clin Immunol, S-58185 Linkoping, Sweden