1) Litvan I, Mangone CA, McKee A et al: Natural history of progressive supranuclear palsy (Steele-Rechardson-Olszewski syndrome) and clinical predictors of survival: a clinicopathological study. J Neurol Neurosurg Psychiatry 61: 615-620, 1996
3) Wood BH, Bilclough JA, Bowron A et al: Incidence and prediction of falls in Parkinson's disease: a prospective multidisciplinary study. J Neurol Neurosurg Psychiatry 72: 721-725, 2002
4) Graham JG, Oppenheimer DR: Orthostatic hypotension and nicotine sensitivity in a case of multiple system atrophy. J Neurol Neurosurg Psychiatry 32: 28-34, 1969