A 4-Year Trial of Tiotropium in Chronic Obstructive Pulmonary Disease.
Tashkin, Donald P.; Celli, Bartolome; Senn, Stephen; Burkhart, Deborah; Kesten, Steven; Menjoge, Shailendra; Decramer, Marc; New England Journal of Medicine, 2008, vol. 359, issue 15, p 1543, ISSN 00284793. ISBN 00284793.

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