title: Challenges of meta-analyses pooling non-randomized controlled studies.
authors.forename: Marzia
authors.initials: M
authors.lastname: Lotrionte
authors.forename: Giuseppe G L
authors.initials: GG
authors.lastname: Biondi-Zoccai
authors.forename: Imad
authors.initials: I
authors.lastname: Sheiban
mesh_terms: D006801:Humans; D015201:Meta-Analysis as Topic; D017063:Outcome Assessment, Health Care; D016032:Randomized Controlled Trials as Topic; D012984:Software