title: [Observational research: a fundamental tool for clinical practice].
authors.affiliation: Dipartimento di Cardiologia, IRCCS Policlinico San Matteo, Pavia. l.tavazzi@smatteo.pv.it
authors.forename: Luigi
authors.initials: L
authors.lastname: Tavazzi
authors.forename: Gianni
authors.initials: G
authors.lastname: Tognoni
authors.forename: Aldo Pietro
authors.initials: AP
authors.lastname: Maggioni
mesh_terms: D000328:Adult; D000368:Aged; D002309:Cardiology; D002318:Cardiovascular Diseases / Q000628:therapy; D016903:Drug Monitoring; D016021:Epidemiologic Studies; D006801:Humans; D007558:Italy; D017063:Outcome Assessment, Health Care; D017410:Practice Guidelines as Topic; D011446:Prospective Studies; D016032:Randomized Controlled Trials as Topic; D012106:Research; D012189:Retrospective Studies