History of research training.
D049673:History, 20th Century; D006801:Humans; D009316:National Institutes of Health (U.S.) / Q000266:history; D010036:Otolaryngology / Q000266:history*; D012108:Research Personnel / Q000266:history; D012109:Research Support as Topic; D014146:Training Support / Q000266:history; D014481:United States