RETIEF, C A; RETIEF, H J; VAN DER MERWE, S. 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, South Africa, v. 112, n. 10, p. 795–799, 2022. DOI: 10.7196/SAMJ.2022.v112i10.16590. Disponível em: https://www.samajournals.co.za/index.php/samj/article/view/258. Acesso em: 18 apr. 2026.