Firdaus, H.; Khan, N. A.; Reza, M.; Khan, M. A.; Krishnan, G.; Razak, N. A.; Verma, A.; Shameem, M.; Bhargava, R. Clinicoepidemiological Profile and Outcome in Patients of Covid 19 With Normal Chest X-Ray: Study of 51 Patients. Int J Res Med Sci 2020, 9, 181-185.