OBJECTIVE: To develop and validate a prognostic model for LEF discontinuation with abnormal blood test results. METHODS: Data from the Clinical Practice Research Datalink Gold and Aurum were used for model development and external validation, respect... Read More about Development and validation of a prognostic model for leflunomide discontinuation with abnormal blood tests during long-term treatment: cohort study using data from the Clinical Practice Research Datalink Gold and Aurum.