Canney Canney M M Djurdjev Djurdjev O O Zierold Zierold C C Block Block F F Wolf Wolf M M Levin Levin A A GFR-specific versus GFR-agnostic cutoffs for parathyroid hormone and fibroblast growth factor 23 in advanced chronic kidney disease GFR-specific versus GFR-agnostic cutoffs for parathyroid hormone and fibroblast growth factor 23 in advanced chronic kidney disease Am J Nephrol Am J Nephrol 2019 2019 50 50 105 105 14 14 10.1159/000501189 10.1159/000501189 31238301 31238301. Here, FGF23 is linked to chronic kidney disease.