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