Mov Disord Beylergil, S B, Petersen, M, Gupta, P, Elkasaby, M, Kilbane, C & Shaikh, A G 2021, ' Severity-Dependent Effects of Parkinson's Disease on Perception of Visual and Vestibular Heading ', Movement Disorders, vol. 36, no. 2, pp. 360-369 . https://doi.org/10.1002/mds.28352