“A Randomized Controlled Trial to Compare the Efficacy and Safety of Glycopyrronium Bromide + Salmeterol Fluticasone and Tiotropium Bromide + Salmeterol Fluticasone in Chronic Obstructive Pulmonary Disease”. Innovative Journal of Medical and Health Sciences 10, no. 05 (May 25, 2020): 853–857. Accessed October 23, 2026. http://www.innovativejournal.in/index.php/ijmhs/article/view/2917.