Karim Mohamed Ramadan, Abeer Ahmed Bahnasy, Hanan Ezzat Shafik, Ola Mohamed Khorshid,Mohamed Saad Mohamed 2025. Impact of COVID 19 Infection on Advanced Non-Small Cell Lung Cancer Patients and Correlation with PDL1 Expression. South Eastern European Journal of Public Health. (Jan. 2025), 1020–1025. DOI:https://doi.org/10.70135/seejph.vi.3803.