title: Study duration and validity.
authors.forename: A G
authors.initials: AG
authors.lastname: Logan
mesh_terms: D004039:Diet, Sodium-Restricted; D006801:Humans; D006973:Hypertension / Q000178:diet therapy*; D015201:Meta-Analysis as Topic; D016032:Randomized Controlled Trials as Topic; D012107:Research Design; D013997:Time Factors