title: Pooling of trials is not appropriate in the case of heterogeneity.
authors.forename: C W
authors.initials: CW
authors.lastname: Bollen
authors.forename: C S P M
authors.initials: CS
authors.lastname: Uiterwaal
authors.forename: A J
authors.initials: AJ
authors.lastname: van Vught
mesh_terms: D006612:High-Frequency Ventilation / Q000379:methods*; D006801:Humans; D007231:Infant, Newborn; D007235:Infant, Premature, Diseases / Q000628:therapy*; D015201:Meta-Analysis as Topic; D016032:Randomized Controlled Trials as Topic / Q000379:methods