4Weaning GK, Ben shlomoy, Magalhaes M. Clinical feature and natural history of multiple system atrophy. An analysis of 100 Cases. Brain ,1994; 117: 835.
5Druschky A, Hilz MJ, platsch G. Differentiation of Parkinson's disease and multiple system atrophy in early disease stages by means of 1-123-MIBG-SPECT. J Neurol Sci ,2000; 175:3-12.