Trenkwalder, C., Schwarz, J., Gebhard, J., Ruland, D., Trenkwalder, P., Hense, H. W., & Oertel, W. H. (1995). Starnberg Trial on Epidemiology of Parkinsonism and Hypertension in the Elderly: Prevalence of Parkinson`s disease and related disorders assessed by a door-to-door survey of inhabitants older than 65 years. Archives of Neurology, 52, 1017-1022.