1. Department of Medicine, Sahlgrenska University Hospital, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden.
2. Department of Cardiology, Sahlgrenska University Hospital, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden.
3. Department of Geriatric, Neurology and Rehabilitation, Kungälv Hospital, Kungälv, Sweden.
4. Department of Neurology, Södra Älvsborgs Hospital, Borås, Sweden.