1. Department of Community Medicine and Rehabilitation, Unit of Research, Education and Development-Östersund, Umeå University, Umeå, Sweden
2. Department of Public Health and Clinical Medicine, Unit of Research, Education and Development-Östersund, Umeå University, Umeå, Sweden
3. The Skaraborg Institute, Sweden. Department of Public Health and Community Medicine/Primary Health Care, The Sahlgrenska Academy at the University of Gothenburg, Gothenburg, Sweden
4. Department of Community Medicine and Rehabilitation, Physiotherapy, Umeå University, Umeå, Sweden