@inbook{3509247,
author={Brian E. Harrington, MD},
editor={Hadzic, Admir},
title={Chapter 73. Postdural Puncture Headache},
booktitle={NYSORA Textbook of Regional Anesthesia and Acute Pain Management},
publisher={The McGraw-Hill Companies},
address={New York, NY},
year={2007},
url={accessanesthesiology.mhmedical.com/content.aspx?aid=3509247}
}