[American Thoracic Society American Thoracic Society 2012 International Conference, May 18-23, 2012 • San Francisco, California - ()] B41. COPD: PHARMACOLOGICAL TREATMENT - Evaluation Of The Effect Of Verapamil, An Inhibitor Of P-Glycoprotein And CYP3A4, On Systemic Exposure And Safety Profile Of GSK573719, A New Long-Acting Muscarinic Antagonist, And Vilanterol, An Inhaled Long-Acting ²2 Agonist, In Healthy Adults