The University of Warwick Library - WebBridge

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, Robert J..  Spine.  v. 42. no. 11.   2017-06-01. p. E680 - E686... issn: 0362-2436 .   

Online access not found

Sorry - based on the information provided, WebBridge cannot offer appropriate links.