title: Who did it first?
authors.affiliation: Department of Radiology, St. Joseph Mercy Hospital, Pontiac, MI 48341-2985.
authors.forename: R A
authors.initials: RA
authors.lastname: Gagliardi
mesh_terms: D005060:Europe; D049672:History, 19th Century; D049673:History, 20th Century; D006801:Humans; D011859:Radiography / Q000266:history*; D011871:Radiology / Q000266:history*; D014481:United States