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Sauer BC, VanderWeele T. Supplement 2 Use of Directed Acyclic Graphs. In: Dreyer N, Velentgas P, Nourjah P, Smith S, Torchia M, editors. Developing an Observational CER Protocol: A User’s Guide. Rockville, MD: Agency for Healthcare Research and Quality; 2013. S2. 177-183 p.