title: Gastrointestinal tumours: let there be light.
authors.affiliation: Gloucester Gastroenterology Group, Gloucestershire Royal and Cranfield University Institute of Medical Sciences, UK.
authors.forename: H
authors.initials: H
authors.lastname: Barr
mesh_terms: D004945:Esophagoscopy; D005770:Gastrointestinal Neoplasms / Q000188:drug therapy*; D006801:Humans; D010778:Photochemotherapy