title: Randomization within trials does not contribute to external validity.
authors.forename: Patrick J
authors.initials: PJ
authors.lastname: McGrath
mesh_terms: D006801:Humans; D010147:Pain Measurement; D011897:Random Allocation; D016032:Randomized Controlled Trials as Topic; D015203:Reproducibility of Results; D012107:Research Design; D016896:Treatment Outcome