Allocation of liver grafts worldwide - Is there a best system? - Tschuor, Christoph; Ferrarese, Alberto; Kuemmerli, Christopher; Dutkowski, Philipp; Burra, Patrizia; Clavien, Pierre-Alain; Andraus, Wellington; Chen, Chao-Long; Contreras, Alan G.; Albuquerque, Luiz Augusto Carneiro D. (Journal of hepatology, 2019)