Hafiz Asad Saeed, Muhammad Yasir, Muhammad Hammad, Muhammad Usman Khokhar, Muhammad Farhan Shahid, and Umer-ul- Haq. “Frequency and Etiology of Ventilator-Associated Pneumonia in COVID-19 Patients Presenting to Tertiary Care Hospital”. Pakistan Armed Forces Medical Journal 73, no. 5 (October 30, 2023): 1443–1447. Accessed December 27, 2024. https://pafmj.org/PAFMJ/article/view/9053.