title: Moving forward by looking back: 'retrospective' clinical studies.
authors.affiliation: Department of Orthodontics amd Pediatric Dentistry, University of Michigan 48109-1078, USA. lejjr@umich.edu
authors.forename: L E
authors.initials: LE
authors.lastname: Johnston
mesh_terms: D018849:Controlled Clinical Trials as Topic; D018865:Dental Research / Q000379:methods*; D019317:Evidence-Based Medicine; D006801:Humans; D009971:Orthodontics, Corrective / Q000379:methods*; D012189:Retrospective Studies; D015983:Selection Bias