@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}
}