1. Classification of Parkinsonism;Koller,1987
2. Parkinson's disease incidence in Olmsted County, MN: 1935–1988;Tanner;Neurology,1992
3. Epidemiology of Parkinson's disease;Tanner;Neurol Clin,1992
4. Parkinson's Action Network;Newsletter,1995
5. Future perfect? Presymptomatic diagnosis, neural transplantation and trophic factors;Shults;Neurol Clin,1992