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Sauer BC, Vanderweele TJ. Supplement 2: The Use of Directed Acyclic Graphs on Non-experimental Comparative Effectiveness Research. In: Velentgas P, Dreyer NA, Nourjah P, Smith SR, Torchia MM, editors. Developing a Protocol for Observational Comparative Effectiveness Research: A Users Guide. Rockville, MD: Agency for HealthCare Research and Quality; 2013. Supplement 2. 1-5 p.