Efficacy of Nebulized Long-Acting Bronchodilators (Formoterol and Revefenacin) vs. Short-Acting Bronchodilators (Albuterol and Ipratropium) in Patients Presenting to the Emergency Department With Acute Exacerbation of COPD (ECOPD): A Phase IV, Prospective, Randomized, Blinded, Parallel-group Trial | Arctuva