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APA Citation
Breen, D. P., Williams-Gray, C. H., Mason, S. L., Foltynie, T., & Barker, R. A. (2013). excessive daytime sleepiness and its risk factors in incident Parkinson's disease. Journal of neurology, neurosurgery and psychiatry, 84(2), 233–234. http://access.bl.uk/ark:/81055/vdc_100137792191.0x000037