1 Oslo Delirium Research Group, Department of Geriatric Medicine, Oslo University Hospital, Nydalen, Post box 4950, 0424, Oslo, Norway. l.o.watne@gmail.com.
2 Department of Infectious Diseases, Oslo University Hospital, Oslo, Norway.
3 Institute of Clinical Medicine, University of Oslo, Oslo, Norway.
4 Department of Acute Medicine, Oslo University Hospital, Oslo, Norway.
5 Department of Anaesthesiology, Oslo University Hospital, Oslo, Norway.
6 Division of Emergencies and Critical Care, Oslo University Hospital, Oslo, Norway.
7 Oslo Delirium Research Group, Department of Geriatric Medicine, Oslo University Hospital, Nydalen, Post box 4950, 0424, Oslo, Norway.