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Iwagami, MORCID logo; Tomlinson, LAORCID logo; Mansfield, KEORCID logo; Douglas, IJORCID logo; Smeeth, LORCID logo and Nitsch, DORCID logo (2018). Clinical codelist - Rheumatoid Arthritis read codes. [Dataset]. London School of Hygiene & Tropical Medicine, London, United Kingdom. 10.17037/DATA.00000884. Muzambi, RORCID logo (2020). Clinical codelist - Rheumatoid Arthritis read codes. [Dataset]. London School of Hygiene & Tropical Medicine, London, United Kingdom. 10.17037/DATA.00002059.