@unpublished{publication-14788,
	author={Pei, Zhuan and Pischke, J{\"o}rn-Steffen and Schwandt, Hannes},
	institution={National Bureau of Economic Research},
	number=23232,
	pages=67,
	series={NBER Working Papers},
	title={Poorly measured confounders are more useful on the left than on the right},
	year=2017,
}