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APA Citation
Hely, M. A., Morris, J. G. L., Traficante, R., Reid, W. G. J., O'Sullivan, D. J., & Williamson, P. M. (1999). the Sydney multicentre study of Parkinson's disease: progression and mortality at 10 years. Journal of neurology, neurosurgery and psychiatry, 67(3), 300–307. http://access.bl.uk/ark:/81055/vdc_100137793084.0x000033