title: International Clinical Trials in Radiation Oncology. Gastrointestinal sites.
authors.affiliation: Hermann Holthusen Institute for Radiotherapy, St. George's Hospital, Hamburg, Germany.
authors.forename: H P
authors.initials: HP
authors.lastname: Heilmann
authors.forename: L L
authors.initials: LL
authors.lastname: Gunderson
mesh_terms: D002986:Clinical Trials as Topic; D003131:Combined Modality Therapy; D005770:Gastrointestinal Neoplasms / Q000188:drug therapy / Q000532:radiotherapy* / Q000601:surgery; D006801:Humans; D007391:International Cooperation