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Multiple instruments to assess the patient's perception of disease activity and other critical domains are used in rheumatology to evaluate treatment response and guide clinical decisions. These instruments, known as patient-reported outcomes (PROs), allow to incorporate the patient's perspective.1 Despite PROs being increasingly recognised as important measures, there is great heterogeneity in their use.2 In order to overcome the difficulty in accessing validated PROs and the heterogeneity in its use,3 an initiative to generate a repository of the main cross-culturally validated PROs in rheumatic and musculoskeletal diseases (RMDs) was endorsed by the European League Against Rheumatism (EULAR). The main idea was to develop a structured Outcome Measures Library (OML) that would include a comprehensive database of validated PROs.
The international taskforce defined …