@inbook{1131936772, author={Howard S. Smith and Zahid H. Bajwa}, editor={Bajwa, Zahid H. and Wootton, R. Joshua and Warfield, Carol A.}, title={Urine Drug Testing}, booktitle={Principles and Practice of Pain Medicine, 3e}, publisher={McGraw-Hill Education}, address={New York, NY}, year={2016}, url={neurology.mhmedical.com/content.aspx?aid=1131936772} }