Setiati, S., Harimurti, K., Safitri, E.D., Ranakusuma, R.W., Saldi, S.R.F., Azwar, M.K., Marsigit, J., Pitoyo, Y. and Widyaningsih, W. 2020. Risk factors and laboratory test results associated with severe illness and mortality in COVID-19 patients: A systematic review. Acta Medica Indonesiana. 52, 3 (Oct. 2020), 227.