“…Another important aspect, which has to be taken into account, is that -due to the fact of the retrospective single-centre study design -only medical issues were analysed, disregarding the patient's view of quality of life. Further, the study did not differentiate between patients with a high or low comorbidity rate in the anaylsis of survival, which could hide eventual influences on patient's survival during haemodialysis, as other studies claim [18,23,34]. In addition, there might be a positive selection in the senior population due to the fact that the very ill patients with ESRD underwent conservative therapy and did not start haemodialysis.…”