title: A debt of gratitude.
mesh_terms: D005858:Germany; D049672:History, 19th Century; D049673:History, 20th Century; D011832:Radiation Injuries / Q000266:history*; D011835:Radiation Protection; D011859:Radiography / Q000266:history; D011871:Radiology / Q000266:history*; D006113:United Kingdom