@inbook{1210295614, author={Matthew L. Maciejewski and M. Alan Brookhart}, editor={Livingston, Edward H. and Lewis, Roger J.}, title={Using Instrumental Variables to Address Bias From Unobserved Confounders}, booktitle={JAMA Guide to Statistics and Methods}, publisher={McGraw-Hill Education}, address={New York, NY}, year={2019}, url={jamaevidence.mhmedical.com/content.aspx?aid=1210295614} }