Two physicians that may be doing research concerning Twins and Parkinson Disease are: Donald B. Calne, D.M. University of British Columbia University Hospital M36, Purdy Pavilion 2211 Wesbrook Mall Vancouver, B.C. V6T2B5 Canada Roger C. Duvoisin, M.D. Robert Wood Johnson Med. School Dept. of Neurology, UMDNJ CN 19 New Brunswick, NJ 08903-0019 USA Sylvia Dickinson, R.N., M.S.N. ([log in to unmask]) Rare Disorder Network