Identifying back pain subgroups: developing and applying approaches using individual patient data collected within clinical trials by Shilpa Patel, Siew Wan Hee, Dipesh Mistry, Jake Jordan, Sally Brown, Melina Dritsaki, David R Ellard, Tim Friede, Sarah E Lamb, Joanne Lord, Jason Madan, Tom Morris, Nigel Stallard, Colin Tysall, Adrian Willis, Martin Underwood, the Repository Group

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