Arterial Calcifications in Nocturnal Hemodialysis and Renal Transplantation Versus Conventional Dialysis

To assess whether nocturnal hemodialysis and renal transplantation are associated with less progression of coronary arterial calcification, compared with conventional hemodialysis and peritoneal dialysis; To identify the risk factors for coronary arterial calcification in dialysis and transplant patients, and to assess a possible interaction with treatment modality.