Note that SKMCoffer almost exclusively HDF rather than HD.This has been shown to have a 23% improvement in mortality over HD alone
(Blankestijn, P. J., Vernooij, R. W. M., Hockham, C., Strippoli, G. F. M., Canaud, B., Hegbrant, J., Barth, C., Covic, A., Cromm, K., Cucui, A., Davenport, A., Rose, M., Török, M., Woodward, M., & Bots, M. L. (2023). Effect of Hemodiafiltration or Hemodialysis on Mortality in Kidney Failure. New England Journal of Medicine, 389(8), 700–709. https://doi.org/10.1056/NEJMoa2304820)