title: Letter from the editors.
authors.forename: Leonard M
authors.initials: LM
authors.lastname: Freeman
authors.forename: M Donald
authors.initials: MD
authors.lastname: Blaufox
mesh_terms: D000375:Aging / Q000378:metabolism* / Q000473:pathology*; D003952:Diagnostic Imaging / Q000379:methods* / Q000639:trends*; D006801:Humans; D009369:Neoplasms / Q000175:diagnosis* / Q000378:metabolism*