@inbook{3420684,
author={Samuel C. Sayson and Somayaji Ramamurthy},
editor={Warfield, Carol A. and Bajwa, Zahid H.},
title={Chapter 69. Sympathetic Blocks},
booktitle={Principles & Practice of Pain Medicine, 2e},
publisher={The McGraw-Hill Companies},
address={New York, NY},
year={2004},
url={accessanesthesiology.mhmedical.com/content.aspx?aid=3420684}
}