 The ESRD Patient Registry run by the Korean Society of Nephrology KSN requires dialysis institutions to annually report the number of ESRD patients who receive renal replacement therapy, types of underlying disease, dialysis modality, and cause of death. Though the KSN statistics is useful as isolated epidemiological data, the program participation rate is only 60, and cases of death are rarely reported. Clinical research on treatment or prognosis in CRF in Korea has mostly been performed by a single hospital or university, with no prospective, long-term, multi-center study performed yet. 