Laursen DRT, Nejstgaard CH, Bjørkedal E, Frost AD, Hansen MR, Paludan-Müller AS, Prosenz J, Werner CP, Hróbjartsson A (2023)

Impact of active placebo controls on estimated drug effects in randomised trials: a systematic review of trials with both active placebo and standard placebo. Cochrane Database of Systematic Reviews 3(3):MR000055.
Cochrane methodology review of studies comparing the effects of an active versus a standard placebo

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