@inbook{57377678,
author={Kenneth V. Iserson},
title={Chapter 31. Gastroenterology},
booktitle={Improvised Medicine: Providing Care in Extreme Environments},
publisher={The McGraw-Hill Companies},
address={New York, NY},
year={2012},
url={accessemergencymedicine.mhmedical.com/content.aspx?aid=57377678}
}