Kola, I, S A van Blydenstein, M Kola, S Kooverjee, and S Omar. 2024. “Vitamin D Status in Patients With Chronic Obstructive Pulmonary Disease at Chris Hani Baragwanath Hospital, Johannesburg, South Africa”. African Journal of Thoracic and Critical Care Medicine 30 (3): e1041. https://doi.org/10.7196/AJTCCM.2024.v30i3.1041.