title: Misguided precedent is not a reason to use permuted blocks.
authors.forename: Vance W
authors.initials: VW
authors.lastname: Berger
mesh_terms: D006261:Headache / Q000188:drug therapy*; D006801:Humans; D016032:Randomized Controlled Trials as Topic / Q000379:methods*; D012107:Research Design; D015983:Selection Bias