[1]
M. L. Wong, “What is the cause of this patient’s chronic productive cough?”, Afr J Thoracic Crit Care Med, vol. 28, no. 3, p. 137, Sep. 2022, Accessed: Oct. 02, 2025. [Online]. Available: https://samajournals.co.za/index.php/ajtccm/article/view/239