@inbook{1131933528, author={Daniel P. Gray and Thomas T. Simopoulos}, editor={Bajwa, Zahid H. and Wootton, R. Joshua and Warfield, Carol A.}, title={Facetogenic Pain}, booktitle={Principles and Practice of Pain Medicine, 3e}, publisher={McGraw-Hill Education}, address={New York, NY}, year={2016}, url={accessanesthesiology.mhmedical.com/content.aspx?aid=1131933528} }