Data mainly is collected on an annual basis by the Statistics Norway, used for a variety of planning purposes and aims. In addition there are other data sources:
- Register of all student in higher education (Ministry of Education and Research);
 - State Register of Employers and Employees (Central register of employment relationships in Norway) operated by NAV, and Register of health personnel with authorization (HPR) operated by SAK;
 - Central register of all physicians (GPs – NAV) and specialists (Directorate of Health);
 - Other relevant data at registers in Statistics Norway.
 
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