Transplantation is the preferred treatment for the most serious forms of kidney disease; deceaseddonor and live-donor kidneys are the two sources for transplantation, and these sources are utilized via two different programs. One of these programs, a two-way kidney paired donation (KPD), involves two patient-donor couples, for each of whom transplantation from donor to intended recipient is not...

The existence of two independent components of long-term memory has been demonstrated by the authors. The evidence has been derived from the authors' findings related to the optimum spacing of repetitions in paired-associate learning. The two components are sufficient to explain the optimum spacing of repetitions as well as the spacing effect. Although the molecular counterparts of the two comp...