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APA Citation
Wong, O. W., Chan, A., Wong, A., Lau, C. K., Yeung, J. H., Mok, V., & Chan, S. (2020). prolonged visual fixation as a surrogate marker of cholinergic deficit in Parkinson's disease: A 2-year follow-up study. Parkinsonism & related disorders, 81, 60–66. http://access.bl.uk/ark:/81055/vdc_100117933832.0x00002e