title: A look back. Mouth gag.
authors.affiliation: American College of Gastroenterology, USA.
authors.forename: R E
authors.initials: RE
authors.lastname: Kravetz
mesh_terms: D004864:Equipment and Supplies / Q000266:history*; D049671:History, 18th Century; D049672:History, 19th Century; D006801:Humans; D009055:Mouth