title: Reply to Letter.
authors.affiliation: Department of Endoscopic Diagnostics and Therapeutics, Kyushu University Hospital, Fukuoka, Japan.
authors.forename: Shuji
authors.initials: S
authors.lastname: Shimizu
authors.affiliation: Department of Endoscopic Diagnostics and Therapeutics, Kyushu University Hospital, Fukuoka, Japan.
authors.forename: Takao
authors.initials: T
authors.lastname: Ohtsuka
authors.affiliation: Shimonoseki City Hospital, Shimonoseki, Japan.
authors.forename: Masao
authors.initials: M
authors.lastname: Tanaka