Special section in tribute to Ernst L. Wydner.
D004813:Epidemiology / Q000266:history*; D005858:Germany; D049673:History, 20th Century; D006801:Humans; D010506:Periodicals as Topic / Q000266:history; D011315:Preventive Medicine / Q000266:history*; D011634:Public Health / Q000266:history*; D014481:United States