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This is to certify that ami kyungwoo kang successfully completed and received a passing grade in PH559x: Causal Diagrams: Draw Your Assumptions Before Your Conclusions a course of study offered by HarvardX, an online learning initiative of Harvard University.

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Miguel Hernán

Miguel Hernán

Kolokotrones Professor of Biostatistics and Epidemiology Harvard T.H. Chan School of Public Health

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