Bishop, Annette, Tooth, Stephanie, Protheroe, Joanne, Salisbury, Chris, Ogollah, Reuben O, Jowett, Sue, Hay, Elaine M, Foster, Nadine E, "A pilot cluster randomised controlled trial to investigate the addition of direct access to physiotherapy to usual GP-led primary care for adults with musculoskeletal pain: the STEMS pilot trial protocol (ISRCTN23378642)", Pilot and Feasibility Studies, 2015