1Frieling T, Schindler P, Kuhlbuseh-Zieklam R, et al. Krefeld CONTRA study:conventional peroral Esophago- Gastro-Duodenoscopy (EGD)vs. transnasal EGD-a prospec- tive and randomised study with independent evaluation of conscious sedation, endoscope diameter, and access path[J]. Z Gastroenterol, 2010, 48(8):818-824.
3Mori A, Fushimi N, Asano T, et al. Cardiovascular toler- ance in unsedated upper gastrointestinal endoscopy:prospective randomized comparison between transnasal and conventional oral procedures[J]. Digestive Endoscopy, 2006, 18(4):282-287.
8Campo R, Montserrat E, Brullet E. Transnasal gastroscopy compared to conventional gastroscopy : A randomized study of feasibility, safety and tolerance. Endoscopy, 1998, 30: 448- 452.
9Krakamp B, Parusel M, Saers T. Prospective study comparing conventional and transnasal esophagogastroduodenoscopy for routine diagnosis. Dtsch Med Wochenschr, 2004, 129: 82-86.
