title: Introduction.
authors.affiliation: Department of Radiation Oncology, Massachusetts General Hospital, Boston, MA. Electronic address: jefstathiou@partners.org.
authors.forename: Jason A
authors.initials: JA
authors.lastname: Efstathiou
mesh_terms: D006801:Humans; D015994:Incidence; D008297:Male; D011159:Population Surveillance; D010818:Practice Patterns, Physicians' / Q000706:statistics & numerical data; D011471:Prostatic Neoplasms / Q000453:epidemiology / Q000532:radiotherapy* / Q000601:surgery; D018787:Radiation Oncology; D018570:Risk Assessment; D014481:United States / Q000453:epidemiology