title: Postoperative radiation therapy for rectal cancer: an interim analysis of a prospective, randomized multicenter trial in The Netherlands.
authors.forename: P M
authors.initials: PM
authors.lastname: Poortmans
authors.forename: H P
authors.initials: HP
authors.lastname: Hamers
mesh_terms: D006801:Humans; D009426:Netherlands; D011446:Prospective Studies; D012004:Rectal Neoplasms / Q000532:radiotherapy* / Q000601:surgery