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APA Citation
Bohnen, N. I., Kanel, P., Zhou, Z., Koeppe, R. A., Frey, K. A., Dauer, W. T., Albin, R. L., & Müller, M. L. (2019). cholinergic system changes of falls and freezing of gait in Parkinson's disease. Annals of neurology, 85(4), 538–549. http://access.bl.uk/ark:/81055/vdc_100080187301.0x000044