Willem Kolff: The first years in Cleveland were very, very difficult. Fortunately, I have many interests, so if I cannot make progress with the heart/lung machine, I can improve the artificial kidney. And I can also then begin this kidney transplantation, and that’s what we did. At that time when we entered the field of kidney transplantation, people did not use cadaver kidneys anymore. And, we proved that if we would take a cadaver kidney, put it in a patient without kidneys and dialyze them with one of these machines, that we could keep them alive long enough so that the cadaver kidney would recover from the rigors it had gone through when its previous owner died. That was very important, and also very fascinating and very beneficial.