Maree, D.; Swanepoel, R. A.; Swart, F.; Gray, D. M.; Masekela, R.; Allwood, B. W.; van-Zyl Smit, R. N.; Koegelenberg, C. F. N. Position Statement for Adult and Paediatric Spirometry in South Africa: 2022 Update. Afr J Thoracic Crit Care Med 2022, 28 (4), 181-192. https://doi.org/10.7196/AJTCCM.2022.v28i4.287.