M. . Akhter, R. . Bhuyia, M. A. B. . Siddique, M. M. . Hallaz, A. B. . Mohammad Nurul Alam, and T. Mostafa, “Gastrointestinal symptoms among patients with COVID-19 and their relation with co-morbidities”, Birdem Med J, vol. 13, no. 1, pp. 12–15, Jan. 2023.