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Parkinson's disease: one disease entity or many? Although most neurologists accept that Parkinson's disease (PD) is a unique disorder, we still lack a valid diagnostic biological tool and therefore depend primarily on clinical examination in diagnosis. The distinction between PD and other parkinsonian syndromes is discussed. J Neural Transm Suppl 1999;56:107-11 Korczyn AD Sackler Faculty of Medicine, Tel-Aviv University, Israel. PMID: 10370905, UI: 99299043 <http://www.ncbi.nlm.nih.gov/PubMed/> janet paterson 52 now / 41 dx / 37 onset PO Box 171 Almonte Ontario K0A 1A0 Canada a new voice http://www.geocities.com/SoHo/Village/6263/ [log in to unmask]