title: [The GRADE system: a prologue to the article series in the ZEFQ].
authors: Holger J
authors: HJ
authors: Schünemann
authors: Gero
authors: G
authors: Langer
authors: Joerg J
authors: JJ
authors: Meerpohl
authors: Günter
authors: G
authors: Ollenschläger
authors: Matthias
authors: M
authors: Perleth
mesh_terms: D019317:Evidence-Based Medicine; D005858:Germany; D006801:Humans; D010506:Periodicals as Topic; D017410:Practice Guidelines as Topic; D011643:Publishing; D011785:Quality Assurance, Health Care; D016032:Randomized Controlled Trials as Topic