1 Department of Rheumatology, Stavanger University Hospital, Pb. 8100 Forus, 4068, Stavanger, Norway. mariaboge@hotmail.com.
2 Clinical Neurochemistry Laboratory, Sahlgrenska University Hospital, Mölndal, Sweden.
3 Department of Psychiatry and Neurochemistry, Institute of Neuroscience and Physiology, The Sahlgrenska Academy at the University of Gothenburg, Mölndal, Sweden.
4 UK Dementia Research Institute at UCL, London, UK.
5 Department of Neurodegenerative Disease, UCL Institute of Neurology, London, UK.
6 Research Department, Stavanger University Hospital, Stavanger, Norway.
7 Department of Mathematics and Physics, Bioscience and Environmental Engineering, University of Stavanger, Stavanger, Norway.
8 Department of Neurology, Stavanger University Hospital, Stavanger, Norway.
9 Clinical Neuropsychology Unit, Division of Psychiatry, Stavanger University Hospital, Stavanger, Norway.
10 Instiute of Clinical Medicine, University of Oslo, Oslo, Norway.
11 Division of Radiology and Nuclear Medicine, Oslo University Hospital, Oslo, Norway.
12 Department of Radiology, Stavanger University Hospital, Stavanger, Norway.
13 The Norwegian Centre for Movement Disorders, Stavanger University Hospital, Stavanger, Norway.
14 Department of Chemistry, Bioscience and Environmental Engineering, University of Stavanger, Stavanger, Norway.
15 Department of Internal Medicine, Stavanger University Hospital, Stavanger, Norway.
16 Department of Clinical Science, Faculty of Medicine, University of Bergen, Bergen, Norway.
17 Department of Rheumatology and Infectious Diseases, Kitasato University School of Medicine, Sagamihara, Japan.
18 Department of Rheumatology, Stavanger University Hospital, Pb. 8100 Forus, 4068, Stavanger, Norway.