title: Retraction: Use of tiotropium bromide for pre-operative treatment in chronic obstructive pulmonary disease patients: comparison with oxitropium bromide.
authors.forename: Wataru
authors.initials: W
authors.lastname: Matsuyama
authors.forename: Hideo
authors.initials: H
authors.lastname: Mitsuyama
authors.forename: Yoshimizu
authors.initials: Y
authors.lastname: Koreeda
authors.forename: Ikkou
authors.initials: I
authors.lastname: Higashimoto
authors.forename: Mitsuhiro
authors.initials: M
authors.lastname: Osame
authors.forename: Kimiyoshi
authors.initials: K
authors.lastname: Arimura