@inbook{56854877,
author={Matthew C. Baker and David S. Fefferman, MD and Ciarán P. Kelly, MD},
editor={Henderson, Mark C. and Tierney, Lawrence M. and Smetana, Gerald W.},
title={Chapter 39. Anorectal Pain},
booktitle={The Patient History: An Evidence-Based Approach to Differential Diagnosis, 2e},
publisher={The McGraw-Hill Companies},
address={New York, NY},
year={2012},
url={accessmedicine.mhmedical.com/content.aspx?aid=56854877}
}