Gastrointestinal endoscopy in the 1980s: cost, challenge, and change.
D004724:Endoscopy / Q000191:economics / Q000706:statistics & numerical data / Q000639:trends*; D005257:Fellowships and Scholarships; D005762:Gastroenterology / Q000193:education / Q000639:trends; D005773:Gastroscopy / Q000639:trends*; D006801:Humans; D007422:Intestines; D011216:Practice Management, Medical; D011787:Quality of Health Care; D014481:United States