1. Department for Quality Improvement and Patient Safety, Norwegian Directorate of Health, Oslo, Norway
2. Health Services Research Center, Akershus University Hospital, Lørenskog, Norway
3. Norwegian Computing Center, Oslo, Norway
4. Unit for Public Health and Statistics, Region of Östergötland, Sweden
5. National Board of Health and Welfare, Stockholm, Sweden
6. Swedish Association of Local Authorities and Regions, Stockholm, Sweden