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APA Citation
Pigott, K., Rick, J., Xie, S. X., Hurtig, H., Chen-Plotkin, A., Duda, J. E., Morley, J. F., Chahine, L. M., Dahodwala, N., Akhtar, R. S., Siderowf, A., Trojanowski, J. Q., & Weintraub, D. (2015). longitudinal study of normal cognition in Parkinson disease. Neurology, 85, . http://access.bl.uk/ark:/81055/vdc_100029217738.0x000030