Verma, V., Kumar , A., Singh, R., Uraiya, D., & Tripathi, N. (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), 1404-1410. https://doi.org/10.17511/ijmrr.2016.i08.19