1. Department of Neurobiology, Care Sciences and Society, Center for Alzheimer Research, Division for Neurogeriatrics, Karolinska Institutet, Novum, Huddinge, Stockholm, Sweden
2. King’s College London, Wolfson Centre for Age Related-Diseases, London, UK
3. Department of Physiology, Faculty of Medicine, University of Khartoum, Khartoum, Sudan
4. Department of Physiology and Pharmacology, Karolinska Institutet, Stockholm, Sweden
5. Department of Internal Medicine, the Vrinnevi Hospital, Norrköping, Sweden
6. Institute of Neuroscience and Physiology, Sahlgrenska Academy, Gothenburg University, Gothenburg, Sweden
7. Centre for Age-Related Medicine, Stavanger University Hospital, Stavanger, Norway
8. Department of Neurology, Akershus University Hospital, Oslo, Norway