Havenga H, Coetzee B, Burger RP, Piketh SJ. Response to Simpson (2024): Standard heat stress indices may not be appropriate for assessing marathons. S. Afr. J. Sci. [Internet]. 2024 Jan. 30 [cited 2024 May 19];120(1/2). Available from: https://sajs.co.za/article/view/17474