Past-president's address. A reconsideration of the "Biological Clock in the Unicorn".
D003479:Curriculum; D004501:Education, Medical / Q000266:history; D005060:Europe; D049671:History, 18th Century; D049672:History, 19th Century; D049673:History, 20th Century; D010827:Physiology / Q000193:education*; D014481:United States