1. Department of Clinical Medicine, University of Bergen , 5020 Bergen , Norway
2. Neuro-SysMed, Department of Internal Medicine, Haraldsplass Deaconess Hospital , 5009 Bergen , Norway
3. Oslo Delirium Research Group, Department of Geriatric Medicine, Oslo University Hospital , 0424 Oslo , Norway
4. Institute of Clinical Medicine, University of Oslo , 0318 Oslo , Norway
5. Department of Geriatric Medicine, Akershus University Hospital , 1478 Lørenskog , Norway
6. Department of Geriatric Medicine, Prince of Wales Hospital , 2031 Sydney , Australia
7. Prince of Wales Clinical School, University of New South Wales , 2031 Sydney , Australia
8. Bevital AS , 5021 Bergen , Norway
9. Department of Internal Medicine, Bærum Hospital Vestre Viken Hospital Trust , 1346 Gjettum , Norway
10. Department of Orthopedic Surgery, Akershus University Hospital , 1478 Lørenskog , Norway
11. Department of Clinical Science, University of Bergen , 5020 Bergen , Norway
12. Geriatric Unit, Clinic of Medicine, Diakonhjemmet Hospital , 0319 Oslo , Norway
13. Division of Orthopaedic Surgery, Oslo University Hospital , 0424 Oslo , Norway
14. Orthopaedic Department, Bærum Hospital, Vestre Viken Hospital Trust , 1349 Gjettum , Norway
15. School of Biochemistry & Immunology, Trinity Biomedical Sciences Institute and Trinity College Institute of Neuroscience, Trinity College Dublin , D02 R590 Dublin , Ireland