“Placebo-Controlled Trials on the Safety and Efficacy of Tiotropium Bromide in Patients With Chronic Obstructive Pulmonary Disease and Bronchitis”. International Journal of Life Sciences Biotechnology and Pharma Sciences 21, no. 2 (June 27, 2025): 10–22. Accessed March 12, 2026. https://ijlbps.net/index.php/ijlbps/article/view/191.