title: Parkinsonism: onset, progression, and mortality. 1967.
authors.forename: M M
authors.initials: MM
authors.lastname: Hoehn
authors.forename: M D
authors.initials: MD
authors.lastname: Yahr
mesh_terms: D017668:Age of Onset; D018450:Disease Progression; D049673:History, 20th Century; D006801:Humans; D020734:Parkinsonian Disorders / Q000209:etiology / Q000266:history* / Q000401:mortality