Kidney Function TestsKidneyKidney Failure, ChronicKidney DiseasesGlomerular Filtration RateRenal Insufficiency, ChronicLiver Function TestsCreatinineKidney TransplantationCystatin CRespiratory Function TestsAcute Kidney InjuryChronic DiseaseKidney TubulesThyroid Function TestsProteinuriaAlbuminuriaRisk FactorsKidney CortexBiological MarkersRenal DialysisKidney GlomerulusRenal InsufficiencyNephrologyDisease ProgressionPolycystic Kidney DiseasesTime FactorsKidney Tubules, ProximalProspective StudiesDiabetic NephropathiesCystatinsCohort StudiesPancreatic Function TestsCardiovascular DiseasesNephrectomyFollow-Up StudiesCross-Sectional StudiesKidney NeoplasmsSeverity of Illness IndexRetrospective StudiesTreatment OutcomeKidney MedullaPrevalence