Wang Y, Wang L, Zhan D. Differential Causal Associations of Gut Microbiota, Blood Metabolites, and Immune Cell Phenotypes With Early- and Late-Onset Alzheimer’s Disease: A Bidirectional Mendelian Randomization Analysis. Cureus. 2026 May 24;18(5):e109543. doi: 10.7759/cureus.109543. PMID: 42344833; PMCID: PMC13289579.