@inbook{1184347153, author={Gursharan Sohi and Michael Pratte}, title={Use of in vitro fertilization, twin pregnancies and advanced maternal age independently associated with adverse maternal outcomes}, booktitle={2 Minute Medicine}, publisher={McGraw Hill}, address={New York, NY}, year={2015}, url={accessmedicine.mhmedical.com/updatesContent.aspx?gbosid=569892} }