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Randomized trials in orthopaedics: why, how, and when?
Laupacis A, Rorabeck CH, Bourne RB, Feeny D, Tugwell P, Sim DA. Laupacis A, et al. Among authors: tugwell p. J Bone Joint Surg Am. 1989 Apr;71(4):535-43. J Bone Joint Surg Am. 1989. PMID: 2703513
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