1Yagi J, Adachi K, Arima N, et al. A prospective randomized comparative study on the safety and tolerability of transnasal esophagogastroduodenoscopy[J]. Endoscopy, 2005, 37 ( 12 ) : 1226--1231.
2Kataoka H, Hayano J, Mizushima T, et al. Cardiovascular tolerance and autonomic nervous responses in unsedated upper gastrointestinal small-caliber endoscopy: a comparison between transnasal and peroral procedures with newly developed mouthpiece[J-].Dig Endosc,2011,23(1):78--85.
