Craddock, Nicole Leigh, Theresa Burgess, and Kim Buchholtz. 2020. “Does a Greater Training Load Increase the Risk of Injury and Illness in Ultramarathon Runners? : A Prospective, Descriptive, Longitudinal Design”. South African Journal of Sports Medicine 32 (1):1-6. https://doi.org/10.17159/2078-516X/2020/v32i1a8559.