[1] Innogenet NV, B-9052 Ghent, Belgium
[2] Pitea River Valley Hosp, Dept Rehabil, Pitea, Sweden
[3] Malmo Univ Hosp, Neuropsychiat Clin, Dept Clin Neurosci, Malmo, Sweden
[4] Karolinska Inst, Huddinge Univ Hosp, Geriatr Med Sect, Dept Clin Neurosci & Family Med, S-10521 Stockholm, Sweden
[5] Univ Gothenburg, Unit Neurochem, Dept Clin Neurosci, S-41320 Gothenburg, Sweden