title: [Evidence based cardiology--IV. Main research strategies and recommendation levels in cardiology].
authors.affiliation: Instituto Dante Pazzanese de Cardiologia, São Paulo.
authors.forename: A
authors.initials: A
authors.lastname: Avezum
mesh_terms: D002309:Cardiology; D016022:Case-Control Studies; D015331:Cohort Studies; D003430:Cross-Sectional Studies; D019317:Evidence-Based Medicine / Q000379:methods*; D006801:Humans; D016032:Randomized Controlled Trials as Topic; D012107:Research Design