@inbook{57916551,
author={Christina J. Seo},
editor={Schrope, Beth},
title={Chapter 12. Anorectal Ultrasound},
booktitle={Surgical and Interventional Ultrasound},
publisher={The McGraw-Hill Companies},
address={New York, NY},
year={2014},
url={accesssurgery.mhmedical.com/content.aspx?aid=57916551}
}