Arshad, Y., Ayub, H., Akhtar, N. and Usmani, Q.A. 2024. Risk Factors of Non-Invasive Ventilation Failure in COPD Patients Presenting with Acute Exacerbation. Pakistan Journal of Medicine and Dentistry. 13, 1 (Feb. 2024), 81–87. DOI:https://doi.org/10.36283/PJMD13-1/015.