Autonomic dysfunction in parkinsonian disorders: assessment and pathophysiology.
Asahina, Masato 1; Vichayanrat, Ekawat 2,3; Low, David A 2,3; Iodice, Valeria 2,3; Mathias, Christopher J 2,3
[Review] Journal of Neurology, Neurosurgery & Psychiatry. 84(6):674-680, June 2013.

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