From Black Box to Clear Insight: A Systematic Review of Human and Porcine Splenic Ex Vivo Perfusion Models. - Al Saoudi T; Poopala Rayan EQ; Divall P; Alnabati N; Chung W; Isherwood J; Malde D; Issa E; Schilcher K; Garcea G; Oggioni MR; Dennison A (Cureus, 2026)