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00925njm 22002777a 4500 dc Hernán, Miguel A author Monge Corella, Susana author 2023-06-07 Effect estimates may be biased when the study design or the data analysis is conditional on a collider—a variable that is caused by two other variables. Causal directed acyclic graphs are a helpful tool to identify colliders that may introduce selection bias in observational research. BMJ. 2023 Jun 7;381:1135. 10.1136/bmj.p1135 1756-1833 BMJ (Clinical research ed.) 37286200 http://hdl.handle.net/20.500.12105/16171 Selection bias due to conditioning on a collider