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Froud, Robert J., Rajendran, Dévan, Patel, Shilpa, Bright, Philip, Bjørkli, Tom, Eldridge, Sandra, Buchbinder, Rachelle and Underwood, Martin (2017) 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. Spine, 42 (11). E680-E686. doi:10.1097/BRS.0000000000001953 ISSN 0362-2436.