@inbook{1186809813, author={Xiqian Huo and Jane Armitage}, editor={Livingston, Edward H. and Lewis, Roger J.}, title={Use of Run-in Periods in Randomized Trials}, booktitle={JAMA Guide to Statistics and Methods}, publisher={McGraw-Hill Education}, address={New York, NY}, year={2019}, url={jamaevidence.mhmedical.com/content.aspx?aid=1186809813} }