FO002FIBROBLAST GROWTH FACTOR 23 IS ASSOCIATED WITH FRACTIONAL SODIUM EXCRETION IN PATIENTS WITH CHRONIC KIDNEY DISEASE. (18th May 2018) - Xu, Hong; Hashem, Ali; Witasp, Anna; Mencke, Rik; Stenvinkel, Peter; Barany, Peter; Bruchfeld, Annette; Wernerson, Annika; Carrero, Juan-Jesus; Olauson, Hannes