A mixed-methods feasibility study of a comorbidity-adapted exercise program for low back pain in older adults (COMEBACK): a protocol by Katie de Luca, Megan Yanz, Aron Downie, Julie Kendall, Søren T. Skou, Jan Hartvigsen, Simon D. French, Manuela L. Ferreira, Sita M. A. Bierma-Zeinstra

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