Asma Shabbir, et al. ā€œHistopathological Spectrum of Premalignant and Malignant Lesions of Esophagus in the Population of Karachiā€. Pakistan Journal of Medicine and Dentistry, vol. 9, no. 2, Apr. 2020, pp. 3-7, https://doi.org/10.36283/PJMD9-2/002.