1. Patients: with RA (either defined by the American College of Rheumatology criteria or as defined in the articles), aged ≥ 18 years of age. 2. Intervention: Not applicable. 3. Comparator: Not applicable. 4. Outcome: papers that reported adherence/compliance data with disease-modifying antirheumatic drugs or other antiarthritis medications*, such as nonsteroidal antiinflammatory drugs and steroids, or factors associated with adherence. 5. Study design: observational studies and controlled clinical trials (only the control group).
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