Corrigendum: Elevated Gut Microbiome-Derived Propionate Levels Are Associated With Reduced Sterile Lung Inflammation and Bacterial Immunity in Mice - Tian, Xiaoli; Hellman, Judith; Horswill, Alexander R.; Crosby, Heidi A.; Francis, Kevin P.; Prakash, Arun (Frontiers in Microbiology, 2019)