A Real World Study to Assess the Effectiveness of Switching to Once Daily Closed Triple Therapy from Mono/Dual Combination or Open Triple Therapy in Patients with Chronic Obstructive Pulmonary Disease. - Huang WC; Chen CY; Liao WC; Wu BR; Chen WC; Tu CY; Chen CH; Cheng WC (International journal of chronic obstructive pulmonary disease, 2021)