Verma, VK, Anoop Kumar, RR Singh, D Uraiya, and N. Tripathi. 2016. “Spectrum of Non-Motor Neuropsychiatric Symptoms Among Patients With Parkinson’s Disease and Parkinson Plus Syndrome”. International Journal of Medical Research and Review 4 (8), 1404-10. https://doi.org/10.17511/ijmrr.2016.i08.19.