Instrumental variables I: instrumental variables exploit natural variation in nonexperimental data to estimate causal relationships.
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M Alan Brookhart | Jeremy A Rassen | Sebastian Schneeweiss | Robert J Glynn | Murray A Mittleman | J. Rassen | S. Schneeweiss | R. Glynn | M. Brookhart | M. Mittleman | Robert J. Glynn | Murray A. Mittleman
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