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Chou R; Qaseem A; Snow V; et al. (2007). «Diagnosis and treatment of low back pain: a joint clinical practice guideline from the American College of Physicians and the American Pain Society». Ann. Intern. Med. 147 (7): 478–91. PMID17909209. doi:10.7326/0003-4819-147-7-200710020-00006Parâmetro desconhecido |author-separator= ignorado (ajuda)
van Tulder MW, Touray T, Furlan AD, Solway S, Bouter LM (2003). Van Tulder, Maurits W, ed. «Muscle relaxants for non-specific low back pain». Cochrane Database Syst Rev (2): CD004252. PMID12804507. doi:10.1002/14651858.CD004252 !CS1 manut: Nomes múltiplos: lista de autores (link)