title: White Ball Sign.
authors.affiliation: Department of Medicine, Division of Gastroenterology, University of Toronto, Toronto, Ontario, Canada.
authors.forename: Callum
authors.initials: C
authors.lastname: Dargavel
authors.affiliation: Department of Medicine, Division of Gastroenterology, University of Toronto, Toronto, Ontario, Canada.
authors.forename: Samir C
authors.initials: SC
authors.lastname: Grover