title: In Memoriam: Peter Kramer (1 November 1935-16 January 2009).
authors.forename: Rutger-Jan
authors.initials: RJ
authors.lastname: Nievelstein
authors.forename: Erik
authors.initials: E
authors.lastname: Beek
mesh_terms: D049673:History, 20th Century; D049674:History, 21st Century; D009426:Netherlands; D010372:Pediatrics / Q000266:history*; D010820:Physicians / Q000266:history*; D011871:Radiology / Q000266:history*