1S. Al-Hadeedi F.R.C.S.I.,Professor D. J. Leaper M.D., Ch.M., F.R.C.S.. Falls in hemoglobin saturation during ERCP and upper gastrointestinal endoscopy[J] 1991,World Journal of Surgery(1):88~94
2Angelita Habr-Gama M.D.,Jerome D. Waye M.D.. Complications and hazards of gastrointestinal endoscopy[J] 1989,World Journal of Surgery(2):193~201