"Back Pain.” Mayo Clinic, Mayo Foundation for Medical Education and Research, 4 Aug. 2018, www.mayoclinic.org/diseases-conditions/back-pain/symptoms-causes/syc-20369906.
“Low Back Pain Fact Sheet.” National Institute of Neurological Disorders and Stroke, U.S. Department of Health and Human Services, www.ninds.nih.gov/Disorders/Patient-Caregiver-Education/Fact-Sheets/Low-Back-Pain-Fact-Sheet.
Harvard Health Publishing. “What Triggers Back Pain?” Harvard Health Blog, Harvard Health Publishing, www.health.harvard.edu/pain/what-triggers-back-pain.
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