title: Introduction.
mesh_terms: D006801:Humans; D016030:Kidney Transplantation / Q000639:trends*; D016031:Liver Transplantation / Q000639:trends*; D016377:Organ Transplantation / Q000639:trends*; D014019:Tissue Donors; D009927:Tissue and Organ Procurement / Q000379:methods* / Q000706:statistics & numerical data*; D014481:United States; D014850:Waiting Lists