title: Parkinsonian features: when are they Parkinson disease?
authors.affiliation: Neuropharmacology Unit, Defense and Veteran Head Injury Program, Henry M. Jackson Foundation, and National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, MD 20892-9130, USA. Litvan1@helix.nih.gov
authors.forename: I
authors.initials: I
authors.lastname: Litvan
mesh_terms: D006801:Humans; D010300:Parkinson Disease / Q000175:diagnosis / Q000453:epidemiology / Q000503:physiopathology / Q000628:therapy