1. Department of Clinical Neurophysiology; University Hospital; Linköping Sweden
2. Department of Nursing; School of Health and Welfare; Jönköping University; Jönköping Sweden
3. Institute of Gerontology; School of Health and Welfare; Jönköping University; Jönköping Sweden
4. Department of Cardiology and Department of Medical and Health Sciences; Linköping University; Linköping Sweden