[1] Univ Gothenburg, Sahlgrenska Univ Hosp, Dept Clin Chem & Transfus Med, Sahlgrenska Acad,Inst Biomed, SE-41345 Gothenburg, Sweden
[2] Univ Gothenburg, Sahlgrenska Univ Hosp, Dept Psychiat & Neurochem, Inst Neurosci & Physiol, SE-41345 Gothenburg, Sweden
[3] Lund Univ, Dept Clin Sci Malmo, Clin Memory Res Unit, Malmo, Sweden
[4] Malmo Univ Hosp, Neuropsychiat Clin, Malmo, Sweden
[5] Karolinska Univ Hosp Huddinge, Karolinska Inst, Sect Clin Geriatr, Neurotec Dept, Stockholm, Sweden