Effectiveness of PhysioDirect telephone assessment and advice services for patients with musculoskeletal problems: pragmatic randomised controlled trial.
Salisbury C, Montgomery AA, Hollinghurst S, Hopper C, Bishop A, Franchini A, Kaur S, Coast J, Hall J, Grove S, et al. BMJ. 2013 Jan 29; 346:f43. Epub 2013 Jan 29.