@inbook{1100066363, author={Nicholas B. Galifianakis, MD, MPH and A. Ghazinouri, MD}, editor={Williams, Brie A. and Chang, Anna and Ahalt, Cyrus and Chen, Helen and Conant, Rebecca and Landefeld, C. Seth and Ritchie, Christine and Yukawa, Michi}, title={Parkinson Disease & Essential Tremor}, booktitle={Current Diagnosis & Treatment: Geriatrics, 2e}, publisher={McGraw-Hill Education}, address={New York, NY}, year={2014}, url={accessmedicine.mhmedical.com/content.aspx?aid=1100066363} }