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Abstract
Letters 3. Victora CG, Habicht JP, Bryce J. Evidence-based public health: moving emergency departments that did not implement the interven- 4 beyond randomized trials. Am J Public Health. 2004;94(3):400-405. tion, matched on patient and hospital characteristics. For this doi:10.2105/AJPH.94.3.400 study, although we cannot exclude the possibility that differ- 4. Stanley B, Brown GK, Brenner LA, et al. Comparison of the safety planning ences in usual care unrelated to the intervention accounted...