1. Institute of Gerontology; School of Health and Welfare; Jönköping University; Jönköping Sweden
2. Regional Development Council of Jönköping County; Jönköping Sweden
3. Department of Clinical Sciences; Lund University; Malmö Sweden
4. Department of Medical and Health Sciences; Linköping University; Linköping Sweden
5. Department of Medical Epidemiology and Biostatistics; Karolinska Institutet; Stockholm Sweden