1. Department of Nursing, Umeå University, S-90187, Umeå, Sweden
2. HeartNet, Skeria 4, S-93177, Skellefteå, Sweden
3. Department of Medicine-Geriatric, S-93186, Skellefteå County Hospital, Sweden
4. Department of Public Health and Clinical Medicine, Umeå University, S-90187, Umeå, Sweden