“Meta-Analysis: The Effect of Breathing Exercise on Respiratory Function in COVID-19 Patients”, J Epidemiol Public Healt, vol. 6, no. 4, pp. 495–504, Oct. 2021, Accessed: Oct. 14, 2025. [Online]. Available: https://jepublichealth.com/index.php/jepublichealth/article/view/451