Placebo-controlled trials on the safety and efficacy of tiotropium bromide in patients with chronic obstructive pulmonary disease and bronchitis. Int. J. Life. Sci. Biotech. Pharm. Sci [Internet]. 2025 Jun. 27 [cited 2026 Mar. 12];21(2):10-22. Available from: https://ijlbps.net/index.php/ijlbps/article/view/191