Corrigendum: Bacteroides fragilis Prevents Clostridium difficile Infection in a Mouse Model by Restoring Gut Barrier and Microbiome Regulation - Deng, Huimin; Yang, Siqi; Zhang, Yucheng; Qian, Kai; Zhang, Zhaohui; Liu, Yangyang; Wang, Ye; Bai, Yang; Fan, Hongying; Zhao, Xinmei; Zhi, Fachao (Frontiers in Microbiology, 2019)