Decisional regret is a negative feeling, involving distress or remorse following a decision. This has been studied in several areas such as psychology, economy or marketing. Patients suffering from end-stage renal disease may choose between dialysis and transplantation. This decision-making process is shared with the nephrologist, who explained to the patient the pros and cons of these two possibilities. Although transplantation offers a better life expectancy and quality of life than dialysis, nothing is known about the proportion of patients regretting their choice to be transplanted. The DONOR study aims to determine the proportion of patients regretting their decision, in a prospective cohort of renal transplant recipients. The decisional regret will be assessed by the DRS (Decisional Regret Scale), associated with the RetransQoL, a quality of life questionnaire.