Renal DialysisHemodialysis Units, HospitalCapital ExpendituresDithioerythritolKidney Failure, ChronicPeritoneal DialysisDialysisDialysis SolutionsPeritoneal Dialysis, Continuous AmbulatoryUltrasonographyUltrasonicsUltrasonic TherapyHigh-Intensity Focused Ultrasound AblationUltrasonography, InterventionalMicrobubblesPeritonitisPeritoneumUltrasonography, PrenatalIntensive Care UnitsProspective StudiesTransducersTime FactorsCatheters, IndwellingUltrasonography, DopplerRetrospective StudiesUltrasonography, Doppler, ColorHemodialysis SolutionsSensitivity and SpecificityTreatment OutcomePregnancyUltrafiltrationMicroscopy, AcousticReproducibility of ResultsContrast MediaUrea