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Standard reference values for musculoskeletal ultrasonography
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    Inappropriate use of bilateral measurements and correlations.

    Dear Editor,

    In the paper by Schmidt et al, measurements of the left and right extremities of the same subjects seem to have been pooled to calculate standard reference values for musculoskeletal ultrasonography [1]. However, it is common knowledge that right and left measurements are tied and should not be mixed in order to get a larger “study sample”.

    In the same paper, correlations have been...

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    Conflict of Interest:
    None declared.