Evaluation of preferable insertion routes for esophagogastroduodenoscopy using ultrathin endoscopes

Satoshi Ono, Keiko Niimi, Mitsuhiro Fujishiro, Yu Takahashi, Yoshiki Sakaguchi, Chiemi Nakayama, Chihiro Minatsuki, Rie Matsuda, Itsuko Hirayama-Asada, Yosuke Tsuji, Satoshi Mochizuki, Shinya Kodashima, Nobutake Yamamichi, Atsuko Ozeki, Lumine Matsumoto, Yumiko Ohike, Tsutomu Yamazaki, Kazuhiko Koike