Sijapati, MJ, N Bhatta, B Khanal, M Lamsal, and S Chaudhary. “Study of Factors Determining Outcomes in the Hospitalized Patients With Acute Exacerbation of Chronic Obstructive Pulmonary Disease (COPD)”. Journal of Universal College of Medical Sciences 2, no. 2 (September 27, 2014): 28–34. Accessed August 13, 2022. https://www.nepjol.info/index.php/JUCMS/article/view/11171.