E. Castillo-Rivera, R. Cacha-Villacorta, C. A. Sánchez-Cubas, and V. Bardales-Zuta, “Serial ferritin in the prognosis of mortality in patients with severe pneumonia due to SARS-CoV-2”, Rev. Cuerpo Med. HNAAA, vol. 14, no. Supl. 1, pp. 86–87, Nov. 2021.