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APA Citation
Hüllemann, P., Keller, T., Kabelitz, M., Gierthmühlen, J., Freynhagen, R., Tölle, T., Forstenpointner, J., & Baron, R. (n.d.). clinical Manifestation of Acute, Subacute, and Chronic Low Back Pain in Different Age Groups: Low Back Pain in 35, 446 Patients. Pain practice, 18(8), 1011–1023. http://access.bl.uk/ark:/81055/vdc_100072633104.0x00001e