Genotypic features of Spinocerebellar Ataxia in Northern China: A Comparative Analysis with Southern China - Bin Chen; Songtao Niu; Xingao Wang; Yutin Ren; Fan Jian; Yuzhi Shi; Hongfei Tai; Hengheng Wang; Zhan Wang; Tao Cui; Wei Li; Hua Pan; et al. (The Cerebellum, 2026)