title: Leaders in medicine: Mark R. Johnson, MD.
authors.forename: R
authors.initials: R
authors.lastname: Green
mesh_terms: D049673:History, 20th Century; D007388:Internal Medicine / Q000266:history; D008007:Licensure, Medical / Q000266:history; D009825:Oklahoma; D010506:Periodicals as Topic / Q000266:history; D012577:Schools, Medical / Q000266:history