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Studies in chronic kidney disease populations suggest that the non–glomerular filtration rate (GFR) determinants of serum levels of the low-molecular-weight protein filtration markers cystatin C, β2-microglobulin (B2M), and beta-trace protein (BTP) are less affected by age, sex, and ethnicity than those of creatinine.Cross-sectional study.Predominantly elderly participants selected from the Age, Gene/Environment...
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