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4Abe K, Hikita T, Yokoe M, et al. The "cross" signs in patients with multiple system atrophy: a quantitative study. J Neuroimaging, 2006, 16:73-77.
5Horimoto Y, Aiba I, Yasuda T, et al. Longitudinal MRI study of multiple system atrophy: when do the findings appear, and what is the course? J Neurol, 2002, 249:847-854.
