title: Subspecialization in radiation oncology.
authors.forename: J E
authors.initials: JE
authors.lastname: Marks
mesh_terms: D000068:Accreditation; D002568:Certification; D006801:Humans; D008495:Medical Oncology / Q000193:education*; D011871:Radiology / Q000193:education*; D011878:Radiotherapy; D013038:Specialization; D014481:United States