IMPLEmenting a clinical practice guideline for acute low back pain evidence-based manageMENT in general practice (IMPLEMENT): Cluster randomised controlled trial study protocol oleh Francis Jill, Michie Susan, Mortimer Duncan, Grimshaw Jeremy M, O'Connor Denise A, French Simon D, McKenzie Joanne E, Spike Neil, Schattner Peter, Kent Peter M, Buchbinder Rachelle, Green Sally E