E. M. Wardani, R. F. Nugroho, D. N. Bistara, R. K. Afiyah, S. N. Hasina, and Y. Septianingrum, “Clinical Manifestations of COVID-19 Patients with Comorbid and Non-comorbid at Dr. Soetomo Hospital, Surabaya”, Open Access Maced J Med Sci, vol. 10, no. G, pp. 330–334, Apr. 2022.