Human Umbilical Cord Mesenchymal Stem Cells in Metabolic Dysfunction-associated Fatty Liver Disease (MAFLD) Therapy: Mechanisms, Clinical Efficacy, and Future Perspectives - Hua Jiang; Hui Wang; Yankun Zhu; Chunyan Yi; Jinli Liu; Ruisi Zhao; Jianpeng Gao; Anmin Cao; Yangfan Guo (Stem Cell Reviews and Reports, 2026)