Corrigendum: Alterations of the Gut Microbiota in Multiple System Atrophy Patients - Wan, Linlin; Zhou, Xin; Wang, Chunrong; Chen, Zhao; Peng, Huirong; Hou, Xuan; Peng, Yun; Wang, Puzhi; Li, Tianjiao; Yuan, Hongyu; Shi, Yuting; Hou, Xiaocan; et al. (Frontiers in Neuroscience, 2020)