- International Symposium on Parkinson's Disease (4)
- Bergmann, Kenneth J. (1)
- Bédard, Paul J. (1)
- Christ, J. F. (1)
- Hassler, R. G. (Rolf G.), 1914- (1)
- International Federation of Parkinson's Disease Foundations (1)
- Poirier, Louis Joseph, 1918- (1)
- Sourkes, Theodore L. (1)
- Streifler, Max B. (1)
- Yahr, Melvin D. (Melvin David), 1917- (1)