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A 4-year trial of tiotropium in chronic obstructive pulmonary disease.

Bibliographic reference Tashkin, Donald P ; Celli, Bartolome ; Senn, Stephen ; Burkhart, Deborah ; Kesten, Steven ; et. al. A 4-year trial of tiotropium in chronic obstructive pulmonary disease.. In: New England Journal of Medicine, Vol. 359, no.15, p. 1543-54 (2008)
Permanent URL http://hdl.handle.net/2078.1/125709