title: In pursuit of the hidden, the occult, and the obscure.
authors.forename: S J
authors.initials: SJ
authors.lastname: Shields
authors.forename: J
authors.initials: J
authors.lastname: Van Dam
mesh_terms: D016145:Endoscopy, Digestive System / Q000379:methods; D005767:Gastrointestinal Diseases / Q000175:diagnosis* / Q000628:therapy*; D006801:Humans