Additional file 1.
Checklist. Both general study information as well as IRT-specific information were extracted, using a purpose-made checklist based on both expert input and important issues as mentioned in Tennant and Conaghan , Reeve and Fayers , and Orlando .
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Siemons et al. BMC Musculoskeletal Disorders 2012 13:216 doi:10.1186/1471-2474-13-216