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Timeline of glomerular filtration rate (GFR) measurements in the African American Study of Kidney Disease (AASK) and Modification of Diet in Renal Disease (MDRD) Study. Symbols indicate mean period of randomization (rectangle), the collection of reference pre-randomization mGFR visit (diamond) when serum creatinine and serum cystatin C were also measured, the collection of another pre-randomization GFR (circle) and the collection of the first post-randomization mGFR (triangle).
