The Power of Low Back Pain Trials: A Systematic Review of Power, Sample Size, and Reporting of Sample Size Calculations over Time, in Trials Published between 1980 and 2012.

Froud R, Rajendran D, Patel S, Bright P, Bjørkli T, Eldridge S, Buchbinder R, Underwood M. Spine (Phila Pa 1976). 2016 Oct 25.

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