Predictive ability of the start back tool: an ancillary analysis of a low back pain trial from Danish general practice.
Allan RiisMichael Skovdal RathleffCathrine Elgaard JensenMartin Bach JensenPublished in: BMC musculoskeletal disorders (2017)
ClinicalTrials.gov NCT01699256 , Nov 29, 2016 (registered retrospectively).