1. Causal diagrams for epidemiologic research. Epidemiol Camb Mass;Greenland,1999
2. Using causal diagrams to understand common problems in social epidemiology;Glymour,2017
3. Biases in randomized trials: a conversation between trialists and epidemiologists;Mansournia;Epidemiol Camb Mass,2017
4. Causal knowledge as a prerequisite for confounding evaluation: an application to birth defects epidemiology;Hernán;Am J Epidemiol,2002
5. Causal directed acyclic graphs and the direction of unmeasured confounding bias;VanderWeele;Epidemiol Camb Mass,2008