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O’Neill, Stephen, Noémi Kreif, Richard Grieve, Matthew Sutton, και Jasjeet S. Sekhon. "Estimating Causal Effects: Considering Three Alternatives to Difference-in-differences Estimation." Health Serv Outcomes Res Methodol 2016.

O’Neill, Stephen, et al. "Estimating Causal Effects: Considering Three Alternatives to Difference-in-differences Estimation." Health Serv Outcomes Res Methodol 2016.