1. Department of Geriatric Medicine, Huddinge Hospital/Karolinska Institute, SE-141 86 Huddinge, Sweden
2. Department of Community Health, County Council of Västerbotten, SE-901 89 Umeå, Sweden
3. Department of Internal Medicine, Norrland University Hospital, SE-901 85 Umeå, Sweden
4. Department of Clinical Chemistry, Norrland University Hospital, SE-901 85 Umeå, Sweden
5. Department of Family Medicine, Norrland University Hospital, SE-901 85 Umedå, Sweden
6. Department of Family Medicine, Norrland University Hospital, SE-901 85 Umeå, Sweden