“Correlation Between Interleukin-1β Serum Level With Severity of Airway Obstruction in Exacerbation Chronic Obstructive Pulmonary Disease (COPD)”. Nusantara Medical Science Journal, vol. 6, no. 2, Jan. 2022, pp. 93-102, https://doi.org/10.20956/nmsj.v6i2.18850.