Dr. Rajendra Kumar, Dr. Amrendra Kumar*. 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. ijmhs [Internet]. 2020 May 25 [cited 2024 Nov. 23];10(05):853-7. Available from: https://innovativejournal.in/index.php/ijmhs/article/view/2917