27. Doty, R.L., D.A. Deems & S. Stellar. 1988. Olfactory dysfunction in parkinsonism: a general \ndeficit unrelated to neurologic signs, disease stage, or disease duration. Neurology 38: \n1237–1244.

\n

28. Doty, R.L., M.B. Stern, C. Pfeiffer, et al. 1992. Bilateral olfactory dysfunction in early stage \ntreated and untreated idiopathic Parkinson’s disease. J. Neurol. Neurosurg. Psychiatry 55: \n138–142.

\n

\n

\n

References found in: Parkinson’s Disease The Dual Hit Theory Revisited. Christopher H. \nHawkes,a Kelly Del Tredici,b and Heiko Braak

\n

Prodromal symptoms