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TOIB Study. Are topical or oral ibuprofen equally effective for the treatment of chronic knee pain presenting in primary care: a randomised controlled trial with patient preference study. [ISRCTN79353052].
Cross PL, Ashby D, Harding G, Hennessy EM, Letley L, Parsons S, Spencer AE, Underwood M; TOIB Study Team. Cross PL, et al. BMC Musculoskelet Disord. 2005 Nov 7;6:55. doi: 10.1186/1471-2474-6-55. BMC Musculoskelet Disord. 2005. PMID: 16274477 Free PMC article. Clinical Trial.