@inbook{3546000,
author={Andreas M. Kaiser},
title={Chapter 1. Symptoms and Differential Diagnosis},
booktitle={McGraw-Hill Manual: Colorectal Surgery},
publisher={The McGraw-Hill Companies},
address={New York, NY},
year={2009},
url={accesssurgery.mhmedical.com/content.aspx?aid=3546000}
}