In Reply to 'Urinary Concentration Capacity, GFR, and Mortality in the General American Population'. Tabibzadeh, Nahid; Stengel, Bénédicte; Haymann, Jean-Philippe. American Journal of Kidney Diseases: The Official Journal of the National Kidney Foundation. 2019; 74: p.572. doi:10.1053/j.ajkd.2019.04.027Article