title: Randomized trials or population-based registries.
authors: D
authors: D
authors: Bergqvist
authors: M
authors: M
authors: Björck
authors: J
authors: J
authors: Säwe
authors: T
authors: T
authors: Troëng
mesh_terms: D015982:Bias; D003627:Data Interpretation, Statistical; D006801:Humans; D011159:Population Surveillance / Q000379:methods*; D016032:Randomized Controlled Trials as Topic / Q000379:methods* / Q000706:statistics & numerical data; D012042:Registries / Q000706:statistics & numerical data*; D015203:Reproducibility of Results; D012107:Research Design