Exploration of the Gut–Brain Axis through Metabolomics Identifies Serum Propionic Acid Associated with Higher Cognitive Decline in Older Persons oleh Jeanne Neuffer, Raúl González-Domínguez, Sophie Lefèvre-Arbogast, Dorrain Y. Low, Bénédicte Driollet, Catherine Helmer, Andrea Du Preez, Chiara de Lucia, Silvie R. Ruigrok, Barbara Altendorfer, Ludwig Aigner, Paul J. Lucassen, Aniko Korosi, Sandrine Thuret, Claudine Manach, Mercè Pallàs, Mireia Urpi-Sardà, Alex Sánchez-Pla, Cristina Andres-Lacueva, Cécilia Samieri