Incidence of axial back pain

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Can someone give me a solid article on the incidence of axial back pain and treatment algorithm? Much appreciated
This isn't an article, doesn't discuss incidence, and isn't a treatment algorithm, but hopefully this helps.

1. Axial low back pain isn't a proper diagnosis, it's a symptom.
2. First step is to rule out red flags then likely time, rest the area, OTC meds, and maybe PT.
3. Next step is to get a proper diagnosis. Treatment depends on what this is.
 
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