Li, T., and X. Xu. “Effect of High-Flow Nasal Oxygen Therapy Combined With Ipratropium Bromide on Th1/Th2 Balance and Inflammation in Patients With Chronic Obstructive Pulmonary Disease and Respiratory Failure: High-Flow Nasal Oxygen Therapy Combined With Ipratropium Bromide on Chronic Obstructive Pulmonary Disease”. Pakistan Journal of Medical Sciences, Vol. 40, no. 9, Sept. 2024, doi:10.12669/pjms.40.9.10221.