@inbook{1131932922,
author={Atif B. Malik and Maaz Sohail and Zahid H. Bajwa},
editor={Bajwa, Zahid H. and Wootton, R. Joshua and Warfield, Carol A.},
title={Botulinum Toxins for the Treatment of Headaches},
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=1131932922}
}