<qa>  What is the name of the study that will investigate the prevalence of such disturbances in patients moreMineral metabolism disturbances occur early during the course of chronic kidney disease and eventually affect most patients. For how long such disturbances persist after a successful renal transplantation is mainly unknown. This study will investigate the prevalence of such disturbances in patients more than 10 years following a successful renal transplantation. The patients will be recruited from an existing registry in Norway. 