Impact of Depression on Progression of Impairment and Disability in Early Parkinson's Disease.
Bega D, Luo S, Fernandez H, Chou K, Aminoff M, Parashos S, Walker H, Russell DS, Christine CW, Dhall R, Singer C, Bodis-Wollner I, Hamill R, Truong D, Mari Z, Glazmann S, Huang M, Houston E, Simuni T. Impact of Depression on Progression of Impairment and Disability in Early Parkinson's Disease. Mov Disord Clin Pract. 2015 Dec; 2(4):371-378.