GoutHyperuricemiaUric AcidGout SuppressantsArthritis, GoutyAllopurinolApazoneUricosuric AgentsGlucose Transport Proteins, FacilitativeXanthine OxidaseMetabolic DiseasesGlomerular Filtration RateKidney Failure, ChronicKidney DiseasesKidney TransplantationRisk FactorsRegression AnalysisBiological MarkersFollow-Up Studies