title: On the comparability of population-based and hospital-based case-control studies.
authors: Nuno
authors: N
authors: Lunet
authors: Ana
authors: A
authors: Azevedo
mesh_terms: D016022:Case-Control Studies; D015331:Cohort Studies; D035061:Control Groups; D006801:Humans; D007297:Inpatients / Q000706:statistics & numerical data*; D010045:Outpatients / Q000706:statistics & numerical data*; D018579:Patient Selection; D012107:Research Design