Forced Expiratory Flow (FEF25–75%) as a Clinical Endpoint in Children and Adolescents with Symptomatic Asthma Receiving Tiotropium: A Post Hoc Analysis by Stanley J. Szefler, Stanley Goldstein, Christian Vogelberg, George W. Bensch, John Given, Branko Jugovic, Michael Engel, Petra M. Moroni-Zentgraf, Ralf Sigmund, Eckard H. Hamelmann

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