Patil P, Gupta N, Parmar L. Effect of bubble PEP on vital parameters in hospitalized COPD patients-an experimental study. Int. J. of Health Sci. [Internet]. 2023 Feb. 27 [cited 2024 Nov. 15];6(S10):1346-61. Available from: https://sciencescholar.us/journal/index.php/ijhs/article/view/14009