title: Introduction.
authors.forename: Sharon B
authors.initials: SB
authors.lastname: Meropol
authors.forename: Michiko
authors.initials: M
authors.lastname: Watanabe
authors.forename: Rocky S
authors.initials: RS
authors.lastname: Tuan
mesh_terms: D000069196:Gastrointestinal Microbiome / Q000502:physiology*; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D007232:Infant, Newborn, Diseases / Q000517:prevention & control*; D007422:Intestines / Q000382:microbiology*