Kola, I., van Blydenstein, S. A., Kola, M., Kooverjee, S., & Omar, S. (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