title: A 4-year trial of tiotropium in chronic obstructive pulmonary disease (UPLIFT trial).
authors.affiliation: UPLIFT Study Investigators.
authors.forename: D
authors.initials: D
authors.lastname: Tashkin
authors.affiliation: UPLIFT Study Investigators.
authors.forename: B
authors.initials: B
authors.lastname: Celli
authors.affiliation: UPLIFT Study Investigators.
authors.forename: S
authors.initials: S
authors.lastname: Senn
authors.affiliation: UPLIFT Study Investigators.
authors.forename: D
authors.initials: D
authors.lastname: Burkhart
authors.affiliation: UPLIFT Study Investigators.
authors.forename: S
authors.initials: S
authors.lastname: Kesten
authors.affiliation: UPLIFT Study Investigators.
authors.forename: S
authors.initials: S
authors.lastname: Menjoge
authors.affiliation: UPLIFT Study Investigators.
authors.forename: M
authors.initials: M
authors.lastname: Decramer