Additional file 2.

List of included articles. Literature searches in PubMed, Scopus and Web of Science resulted in 99 original English-language articles which used some form of IRT-based analysis of patient reported or clinical outcome data in patients with a rheumatic condition.

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Siemons et al. BMC Musculoskeletal Disorders 2012 13:216   doi:10.1186/1471-2474-13-216