title: Randomized controlled trials are needed to close the evidence gap in the prevention of preterm birth.
authors.affiliation: Finnish Institute of Occupational Health, PO Box 310, 70701 Kuopio, Finland. emmakwe@student.uef.fi.
authors.forename: Emma
authors.initials: E
authors.lastname: Kwegyir-Afful
authors.forename: Sharea
authors.initials: S
authors.lastname: Ijaz
authors.forename: Kimmo
authors.initials: K
authors.lastname: Räsänen
authors.forename: Jos
authors.initials: J
authors.lastname: Verbeek
mesh_terms: D019317:Evidence-Based Medicine; D005260:Female; D006801:Humans; D007752:Obstetric Labor, Premature / Q000517:prevention & control*; D011247:Pregnancy; D016032:Randomized Controlled Trials as Topic