title: [Creating a hierarchy of scientific knowledge: the GRADE system].
authors.affiliation: Servicio de Nefrología, Hospital Ramón y Cajal, Madrid, Spain. cquereda.hrc@salud.madrid.org
authors.forename: Carlos
authors.initials: C
authors.lastname: Quereda Rodríguez-Navarro
authors.forename: Vicente
authors.initials: V
authors.lastname: Barrio Lucia
authors.forename: Fernando
authors.initials: F
authors.lastname: García López
mesh_terms: D019317:Evidence-Based Medicine / Q000145:classification*; D017410:Practice Guidelines as Topic / Q000592:standards