@inbook{1120810422, author={Louis Michel Wong Kee Song and Mark Topazian}, editor={Kasper, Dennis and Fauci, Anthony and Hauser, Stephen and Longo, Dan and Jameson, J. Larry and Loscalzo, Joseph}, title={Gastrointestinal Endoscopy}, booktitle={Harrison's Principles of Internal Medicine, 19e}, publisher={McGraw-Hill Education}, address={New York, NY}, year={2014}, url={accessmedicine.mhmedical.com/content.aspx?aid=1120810422} }