Corrigendum: Gut Microbiota as an Objective Measurement for Auxiliary Diagnosis of Insomnia Disorder - Liu, Bingdong; Lin, Weifeng; Chen, Shujie; Xiang, Ting; Yang, Yifan; Yin, Yulong; Xu, Guohuan; Liu, Zhihong; Liu, Li; Pan, Jiyang; Xie, Liwei (Frontiers in Microbiology, 2020)