Kołodziej, Magdalena, and Maciej Kochman. “What’s New in Airway Secretions Clearance for Adults? A Systematic Review”. European Journal of Clinical and Experimental Medicine 19, no. 2 (June 30, 2021): 162–169. Accessed January 18, 2026. https://journals.ur.edu.pl/ejcem/article/view/11889.