title: Trials and fast changing technologies: the case for tracker studies.
authors.affiliation: Department of Public Health and Epidemiology, University of Birmingham, Birmingham B15 2TT.
authors.forename: R J
authors.initials: RJ
authors.lastname: Lilford
authors.forename: D A
authors.initials: DA
authors.lastname: Braunholtz
authors.forename: R
authors.initials: R
authors.lastname: Greenhalgh
authors.forename: S J
authors.initials: SJ
authors.lastname: Edwards
mesh_terms: D003625:Data Collection; D005069:Evaluation Studies as Topic; D019317:Evidence-Based Medicine; D016032:Randomized Controlled Trials as Topic / Q000379:methods* / Q000639:trends; D018401:Sample Size