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Hierarchy classification of transplant groups with all transplants (blue tier 1) divided into live and deceased donor kidney transplants (blue tier 2). DDKTs are further divided into subgroups based on storage method (blue tier 3). DDKTs stored by SCS and HMP are further divided into subgroups based on risk of graft failure (blue tier 4). Each end-tier transplant group is divided into recovery groups based on requirement of dialysis (green and red).
