6Macpherson AJ, Uhr T. Induction of protective IgA by intestinal dendritic cells carrying commensal bacteria [ J ]. Science, 2004, 303(5664) : 1662-1665.
7Guamer F, Malagelada JR. Gut flora in health and disease [ J ]. Lancet, 2003, 361(9356): 512-519.
8Aziz Q, Dore J, Emmanuel A, et al. Gut micmbiota and gastroin- testinal health: current concepts and future directions[ J] . Neuro- gastroenterol & Motility, 2013, 25( 1 ) : 4-15.