Retief CA, Retief HJ, 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. S Afr Med J [Internet]. 2022 Oct. 5 [cited 2026 Apr. 18];112(10):795-9. Available from: https://www.samajournals.co.za/index.php/samj/article/view/258