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    Kelly, V., Johnson, C., McGough, E., Shumway-Cook, A., Horak, F., Chung, K., Espay, A., Revilla, F., Devoto, J., Wood-Siverio, C., Factor, S., Cholerton, B., Edwards, K., Peterson, A., Quinn, J., Montine, T., Zabetian, C., & Leverenz, J. (2015). association of cognitive domains with postural instability/gait disturbance in Parkinson's disease. Parkinsonism & related disorders, 21(7), 692–697. http://access.bl.uk/ark:/81055/vdc_100025922732.0x000049