Categorization of upper gastrointestinal symptoms is useful in predicting background factors and studying effects and usages of digestive drugs

Nobutake Yamamichi, Takeshi Shimamoto, Yoshiki Sakaguchi, Yu Takahashi, Shinya Kodashima, Chiemi Nakayama, Chihiro Minatsuki, Satoshi Ono, Satoshi Mochizuki, Rie Matsuda, Itsuko Asada-Hirayama, Keiko Niimi, Mitsuhiro Fujishiro, Yosuke Tsuji, Chihiro Takeuchi, Hikaru Kakimoto, Osamu Goto, Toru Mitsushima, Kazuhiko Koike