title: Introduction to the "paradigm shifts in perspective" series.
authors.affiliation: Department of Medicine, UCLA School of Medicine, West LA VAMC, Bldg. 114/Room 217E, Los Angeles, CA 90073, USA. jdkaunitz@gmail.com
authors.forename: Jonathan D
authors.initials: JD
authors.lastname: Kaunitz
mesh_terms: D003424:Crohn Disease / Q000209:etiology / Q000378:metabolism; D005762:Gastroenterology / Q000639:trends*; D006801:Humans; D007413:Intestinal Mucosa / Q000378:metabolism; D010539:Permeability; D010686:Philosophy, Medical