[Trends in liver transplantation research in Europe and in the United States].
D005060:Europe; D006801:Humans; D008107:Liver Diseases / Q000401:mortality / Q000601:surgery; D016031:Liver Transplantation; D008722:Methods; D011379:Prognosis; D014019:Tissue Donors; D014021:Tissue Preservation; D014481:United States