From earlier pages.
D002681:China; D005060:Europe; D049673:History, 20th Century; D006801:Humans; D007251:Influenza, Human / Q000000981:diagnostic imaging / Q000266:history; D011014:Pneumonia / Q000000981:diagnostic imaging / Q000266:history; D011859:Radiography; D011871:Radiology / Q000266:history*; D014481:United States