%0 Journal Article %T Correction: Opportunities and challenges for real-world studies on chronic inflammatory joint diseases through data enrichment and collaboration between national registers: the Nordic example %D 2018 %R 10.1136/rmdopen-2018-000655corr1 %J RMD Open %P rmdopen-2018-000655corr1 %V 4 %N 1 %U https://rmdopen.bmj.com/content/rmdopen/4/1/rmdopen-2018-000655corr1.full.pdf