International Kidney Paired Donation Programs: Evolution and Practices of 4 Large Collaborations. - Klimentova X; Domínguez-Gil B; Viana A; Manlove D; Andersson T; Ashkenazi T; Berlakovich G; Böhmig GA; Burton J; Coll E; Dittmer I; Fiaschetti P; et al. (Transplantation, 2026)