Two great American surgeons, each with four aces.
D006348:Cardiac Surgical Procedures / Q000266:history; D002765:Cholecystography / Q000266:history; D013502:General Surgery / Q000266:history*; D049673:History, 20th Century; D006801:Humans; D011013:Pneumonectomy / Q000266:history; D013934:Thymectomy / Q000266:history; D014481:United States