Chou R, Huffman LH (2007). ”Medications for acute and chronic low back pain: a review of the evidence for an American Pain Society/American College of Physicians clinical practice guideline” (på engelska). Annals of Internal Medicine 147 (7): sid. 505–514. doi:10.7326/0003-4819-147-7-200710020-00008. ISSN0003-4819. PMID 17909211.
Chou R, Huffman LH (2007). ”Medications for acute and chronic low back pain: a review of the evidence for an American Pain Society/American College of Physicians clinical practice guideline” (på engelska). Annals of Internal Medicine 147 (7): sid. 505–514. doi:10.7326/0003-4819-147-7-200710020-00008. ISSN0003-4819. PMID 17909211.
Chou R, Huffman LH (2007). ”Medications for acute and chronic low back pain: a review of the evidence for an American Pain Society/American College of Physicians clinical practice guideline” (på engelska). Annals of Internal Medicine 147 (7): sid. 505–514. doi:10.7326/0003-4819-147-7-200710020-00008. ISSN0003-4819. PMID 17909211.