title: The "bicycle sign" for atypical parkinsonism.
authors.forename: M B
authors.initials: MB
authors.lastname: Aerts
authors.forename: W F
authors.initials: WF
authors.lastname: Abdo
authors.forename: B R
authors.initials: BR
authors.lastname: Bloem
mesh_terms: D001642:Bicycling; D003937:Diagnosis, Differential; D006801:Humans; D009422:Nervous System Diseases / Q000175:diagnosis / Q000503:physiopathology; D019370:Observation; D010300:Parkinson Disease / Q000175:diagnosis / Q000503:physiopathology; D020734:Parkinsonian Disorders / Q000175:diagnosis* / Q000503:physiopathology*; D011237:Predictive Value of Tests; D011446:Prospective Studies; D012720:Severity of Illness Index; D011795:Surveys and Questionnaires