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 [22], Reeve and Fayers [15], and Orlando [23].

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