G. R., S., A. A. J., A. Raj, and T. Mathew. “Clinico-Epidemiological Profile and Disease Severity of Chronic Obstructive Pulmonary Disease Among Patients in a Primary Care Centre at Central Kerala”. International Journal Of Community Medicine And Public Health, vol. 10, no. 6, May 2023, pp. 2151-4, doi:10.18203/2394-6040.ijcmph20231695.