Retief, C.A., Retief, H.J. and van der Merwe, S. (2022) “Evaluating the neutrophil-to-lymphocyte ratio as an indicator for early referral of patients with COVID-19 pneumonia to a high-care facility”, South African Medical Journal, 112(10), pp. 795–799. doi:10.7196/SAMJ.2022.v112i10.16590.