@article{freemantle_making_2013,
	title = {Making inferences on treatment effects from real world data: propensity scores, confounding by indication, and other perils for the unwary in observational research},
	volume = {347},
	issn = {1756-1833},
	shorttitle = {Making inferences on treatment effects from real world data},
	url = {http://www.bmj.com/cgi/doi/10.1136/bmj.f6409},
	doi = {10.1136/bmj.f6409},
	language = {en},
	number = {nov11 3},
	urldate = {2016-04-13TZ},
	journal = {BMJ},
	author = {Freemantle, N. and Marston, L. and Walters, K. and Wood, J. and Reynolds, M. R. and Petersen, I.},
	month = nov,
	year = {2013},
	pages = {f6409--f6409}
}

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