title: [The limitations of observational research].
authors.forename: Ate G J
authors.initials: AG
authors.lastname: van der Zee
authors.forename: Elisabeth G E
authors.initials: EG
authors.lastname: de Vries
authors.forename: Michael
authors.initials: M
authors.lastname: Schaapveld
authors.forename: Pax H B
authors.initials: PH
authors.lastname: Willemse
mesh_terms: D019317:Evidence-Based Medicine; D006801:Humans; D019370:Observation; D016032:Randomized Controlled Trials as Topic; D012107:Research Design