title: Case 1: A 12-year-old boy with difficulty swallowing.
authors.affiliation: Division of Pediatric Medicine, Department of Pediatrics.
authors.forename: Anya
authors.initials: A
authors.lastname: McLaren
authors.affiliation: Division of Gastroenterology, Hepatology and Nutrition, Department of Pediatrics.
authors.forename: Margaret
authors.initials: M
authors.lastname: Marcon
authors.affiliation: Division of Pediatric Medicine, Department of Pediatrics, University of Toronto Toronto, Ontario.
authors.forename: Jeremy
authors.initials: J
authors.lastname: Friedman