[1] Univ Gothenburg, Sahlgrenska Acad, Inst Hlth & Care Sci, Box 457, S-40530 Gothenburg, Sweden
[2] Univ Gothenburg, Ctr Person Ctr Care GPCC, Gothenburg, Sweden
[3] Reg Vastra Gotaland, Primary Hlth Care, Narhalsan Res & Dev, Gothenburg, Sweden
[4] Karolinska Inst, Dept Clin Neurosci, Stockholm, Sweden
[5] Univ Gothenburg, Sahlgrenska Acad, Dept Mol & Clin Med, Gothenburg, Sweden
[6] Imperial Coll, Natl Heart & Lung Inst, London, England