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1. Causal Inference Book | Miguel Hernan | Harvard T.H. Chan School of Public Health. Disponible sur: https://www.hsph.harvard.edu/miguel-hernan/causal-inference-book/

2. Hernán MA, Clayton D, Keiding N. The Simpson’s paradox unraveled. Int J Epidemiol. juin 2011;40(3):780‑5.