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Describing a cohort of persons with chronic pain and a cohort of long-term opioid users identified from a national registry linkage.

United statesInternational classification of diseasesNorwegian forum of disabled people organizationsInternational classification of primary careNorwegian registry for primary health careNorwegian chronic pain patient organizationNorth americaOpioid epidemic in norwayBrief overviewPopulation registers includedNorwegian prescription databaseAnatomic therapeutic chemicalNorwegian patient registryInternational classificationSurgical proceduresNorwegian classification