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From stage 1 to end-stage renal failure: Amyloid ß42, amyloid ß40, amyloid ß42/40 ratio, p-tau181 and cognitive function relationship Yasemin Co¿kun Yavuz; Zeynep Biyik; Firdevs Sak; Muslu Kaz¿m Korez; Sedat Abusoglu; Lutfullah Altintepe;