Hashmi, Madiha, et al. “Sensitivity of Carcinoembryonic Antigen Level in Head and Neck, Breast, Lung, Genitourinary, Gastrointestinal Carcinoma”. Pakistan Armed Forces Medical Journal, vol. 73, no. 3, June 2023, pp. 917-20, https://doi.org/10.51253/pafmj.v73i3.6245.