Up front with backs.
Sullivan
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Institute for Work and Health in Toronto.
D003430:Cross-Sectional Studies; D003937:Diagnosis, Differential; D006801:Humans; D015994:Incidence; D017116:Low Back Pain / Q000453:epidemiology / Q000209:etiology* / Q000628:therapy; D009864:Ontario / Q000453:epidemiology; D017410:Practice Guidelines as Topic; D014481:United States; D016270:United States Agency for Healthcare Research and Quality